The Name of Yahu' weh and Yahu'shua as in " Yeh "= "Yah =Strongs 3050" is used in BOTH Names Of The Father And Son.
Yahu'shua is defined in Strong's Exhaustive Concordance by number 3091 
Yahowshuwa` yeh-ho-shoo'-ah or 
Yahowshu`a yeh-ho-shoo'-ah from 03068 and 03467, Greek 2424 
and 919 
; AV-Joshua 218; 218 Joshua or Jehoshua =" Jehovah is salvation" n pr m 1) son of Nun of the tribe of Ephraim and successor to Moses as the leader of the children of Israel; led the conquest of Canaan 2) a resident of Beth-shemesh on whose land the Ark of the Covenant came to a stop after the Philistines returned it 3) son of Jehozadak and high priest after the restoration 4) governor of Jerusalem under king Josiah who gave his name to a gate of the city of Jerusalem
Notice that "" " is read from right to left, which would be " Yod(t-h) He(y-h)- Waw-Shin-Ayin from left to right, and compare the first 3 letters of 3091 of "" "" from right to left is "" Yod-He(y-h)-Waw "".
Then, the Tetragrammaton is YHWH = 3068 
, and is read also from right to left, which would be "" Yod-He(y-h)-Waw-He(y-h).
Notice BOTH Hebrew numbers 3091= of Messiah Yahu'shua and 3068= of Yahuweh=Yahweh for short as many scholars use, but does not change the sound, and has the same 3 Hebrew letters from " right to left " .
Yahweh is defined in Strong's Exhaustive Concordance by number 3068 Yehovah yeh-ho-vaw' from 01961; TWOT-484a; n pr dei AV-LORD 6510, GOD 4, JEHOVAH 4, variant 1; 6519 Jehovah =" the existing One" 1) the proper name of the one true G-d 1a) unpronounced except with the vowel pointings of 0136
Notice the scribes used and added the Strongs Hebrew numbers 136= meaning " lord " ie- Adonia or Adonay and Hebrew number 430= meaning "god " and combinned them with the Tetragrammaton of YHWH.
Hawah is defined in Strong's Exhaustive Concordance by number 1933 and 1944 
hawah to breathe, to be, (in the sense of existence, eternal existance)
The Name of "Je'hovah" means bringer of ruin or destroyer. " Hovah " is defined in Strong's Exhaustive Concordance by Hebrew numbers 1942 and 1943 and has been translated as " ruin and mischief, iniquity, lawlessness". This is one of the many reasons that the name of "Jehovah " is not, nor could ever be used in SUBSTITUTION or alternative for " Yahueh " or "Yahweh ". Not to mention the letter " J " is only about 500 years old, and the last letter that was added in the English language and have never existed in the Hebrew language. Yahweh will become what his people need of him. Yahushua means " Yahweh Saves " or Yahuweh is salvation. The modern name " Jesus " doesn't mean this in any language. Rather than trying to change Yahuweh and Yahushua to fit our needs we should strive to become more like Yahushua. We should walk the path that of the old ways that Yahweh has given us in His Torah or law. This is to confirm that we obey and prove our love to Yahuweh and Yahushua.
The second part of this question was does it lead to salvation or is it required for salvation to call upon the name " Yahuweh " or "Yahweh " which is pronounced the same .
The truth must be told, as the truth will stand before all else.
The name Yah'shua is pronounced silent the letter " waw " because it is silent in Messiah's Name Yahu-shua , though I also use the name of "" Yah'shua "" I do not condemn others for their understanding and use of Yah'shua of for a similar reason, and a I do not condemn those even though they use Y'shua either, but " Yeshua " could not be the correct name of Messiah as will now be proven .
This name was not used until after some of the Yahhudim that returned from Babylonian captivity, and is of more recent origins.
However, since those who use the short name " Yah'shua " are now being singled out by some few others for the use of this name the truth must be shown and known to all for the love of Messiah, and the sake of truth for the common people.
Yod - Produces a "Y" or "I" sound.
Hey(h) - As a Hebrew vowel letter it produces the "Ah" or "Oh" sound (like in #8283 "Sarah" and #8010 Sh'lomoh). Otherwise produces the "H" sound and the "ah" sound would have to be supplied by the reader.
Waw - Also called "Vav". As a Hebrew vowel letter it produces an "oo" (u) or "oh" sound (like in #7307 Ruach). Otherwise produces a "W" sound. This is the ignored or silent letter in the pronunciation "Yah'shua". This letter is nowhere represented. Where is the W or initial U??
Shin - Produces the "sh" sound. The following "oo" sound is indicated by a vowel pointing but Deut. 3:21 and Judges 2:7 actually gives us another "waw" after this letter, proving the "shu" pronunciation that is valid. This is why Strong's 3091= gives 2 possible spellings (see above lexicon graphic). This also eliminates "Yasha/Yahusha" and "Yahoshea/Yahushea" as being possibilities.
Ayin - Silent without a vowel point but indicates an "ah" sound at the end of "Yahu-shua".
Yod(th)-Hey(h)-Waw-Shin-Ayin==Yahu'shua is really Messiah's Name, as for the name Yah'shua for short there is no Hebrew letter " Waw " in it because it is pronounced as silent.
If you really believe those who are deceived ( Rev.12:9) in this world's traditional christian religious denominations who think we cannot know the true Name of YHWH and what the vowel sounds were in Yahuweh's name, then you had better do some digging in the original Hebrew scriptures if you can receive it.
For it only takes a little researching in the original scriptures to find the pronunciation of " Yod- Hey(h)- Waw " which is the first 3 letters in the Tetragrammaton that the scribes had no problem giving the correct written pronunciation of these three letters at the end of many names in " iah " or " jah ".
Here below are a couple examples of names ending in " yahu " or " yah " though the Strongs Exaustive Concordance will show you many many more than these two examples.
Now, please look at the names ending in " iah or jah " that contain Hebrew number 3050 = 
such as Strongs Hebrew number 452==" Eli-jah " or more correctly transliterated is Eli-yahu-w or " Eliyah " for short, and Hebrew number 3470 of " Isa-iah or - Yesha-yahu-w or " Yesha-yahu " for short.
Yahh is defined in Strong's Exhaustive Concordance by number 3050 Yahh yaw contraction for 03068= , and meaning the same, the sacred( saving) name, see names ending with " iah" or " jah ".
The reason I'm making a dash = -- break- in these names is for you to SEE the YAHU in these names and the Hebrew number 3050= which is " YAH "=yaw.
( James H.Strongs , reprinted 1985 in his Hebrew Concordance Dictionary, Page 47 of the Number) 3050 = Yahh. yaw, contraction for 3068== , and mean the same; Jah, the sacred ( saving) name:-Jah the Lord, most vehement, Cp. NAMES IN " iah "-"jah ".
Notice the short " Yahu " in these names at their endings that contain the Strongs Hebrew number 3050 of ( Yah-u ). See thee address below of the Strongs Concordance Lexicon for the many many more examples proving this truth.
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=3050
The names that ends in " Yahu ", there was considered to be no risk in accidentally or mistakenly saying the name "Yahuweh " or as modern scholars use " Yahweh ". This also explains why the scribes used the correct vowel points in the short form of " Yahuweh " or " Yahweh's " name of ( "Yah"= " "= Strongs 3050 ) that only appears in ( Psalms 68:4=Yah= ) of the N. K. J.V.English translation of scriptures.So, the Scribes used the correct vowel pointing in "Hallelu-Yah"( ) at the ending of names, however, the only time they would revert to the "Yeho" pronunciation of these three letters was when it was at the beginning of a Hebrew name.( See Pages 47-48 of the 1985 Edition of the Strongs Exaustive Concordance of all the names beginning with " Yeh " ).
The very fact that Hebrew Number " 3050 of Strongs Concordance= YAH =Yaw " proves the correct beginning prefixes of these names that use " YEH " also ( See Pages 47-48 of Strongs Concordance Hebrew Dictionary ).
See address below for these examples.
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=Yeh
Also, notice that the scribes combined and ADDED the vowel points of Hebrew Numbers " 136 " the meaning of " LORD " to Hebrew numbers =3068 and 3069 of YHWH which is Yod-Hey(h)-Waw-Hey(h).
They also combined and added Hebrew number " 430 " to Hebrew number 3069 as to not repeat saying together either " Elohim Elohim " twice in repetition of the same sound in place of the true name of " Yahweh Elohim " and also it would remind the reader to say either " Adonai " or =Lord " instead or in substitute place of YHWH= Yahuweh or Yahweh for short= Yod-He(y)-Waw-He(y).
This combining of Hebrew number " 136 " which is " Adonay or Adonia " == " Lord " with the four letters of YHWH= Yod-Hey-Waw-Hey is what brought about the false name of " Je' hovah " that was invented in the 14th Century, and is used falsely by the " Je'hovah Witnesses " unto this day.
3068 Yhovah yeh-ho-vaw' from 1961; (the) self-Existent or Eternal; Jehovah, Jewish national name of God:--Jehovah, the Lord. Compare 3050,= with 3069.
3069 Yhovih yeh-ho-vee' a variation of 3068= (used after 136, and pronounced by Jews as 430, in order to prevent the repetition of the same sound, since they elsewhere pronounce 3068= as 136):--God.
See the address below for this proof from the Strongs Lexicon of Hebrew number " 136 "-of the word " lord " that was combined with the four letters YHWH..
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=136
136 'Adonay ad-o-noy' am emphatic form of 113; the Lord (used as a proper name of God only):--(my) Lord.
3069 Yhovih yeh-ho-vee' a variation of 3068= (used after 136, and pronounced by Jews as 430, in order to prevent the repetition of the same sound, since they elsewhere pronounce 3068 = as 136):--God.
Now the added Hebrew number " 430 " combined with the four letters YHWH below meaning GAD= GOD-1408, a variation of 1409= GAWD, from 1464= GUWD used in ( Isa.65:11- see margin center reference at here..
http://bible.crosswalk.com/Lexicons/OldTestamentHebrew/heb.cgi?number=01408&version=kjv
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=430
3069 Yhovih yeh-ho-vee' a variation of 3068= (used after 136, and pronounced by Jews as 430, in order to prevent the repetition of the same sound, since they elsewhere pronounce 3068== as 136):--God.
Now see Hebrew numbers 1408 and 1409 below.
1408 Gad gad a variation of 1409; Fortune, a Babylonian deity:--that troop.
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=1408
Now 1409 1171 Ba`al Gad bah'-al gawd from 1168 and 1409; Baal of Fortune; Baal-Gad, a place in Syria:--Baal-gad
1408 Gad gad a variation of 1409; Fortune, a Babylonian deity:--that troop.
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=1409
If you still don't believe the pronounciation of " GAD" 1408=GAWD and 1409=GAWD = GOD " that is used in modern churchanity today are the one and the same as this Babylonian deity then click on the address below and click on the little speaker BESIDE " GAD " for its same pronounciation as " GOD or GAWD" in English.
http://bible.crosswalk.com/Lexicons/OldTestamentHebrew/heb.cgi?number=01408&version=kjv
The KJV Old Testament Hebrew Lexicon
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Also, if you will look at the first 3 letters in the Hebrew Name number 3091 of Messiah Yahu'shua which is read from right to left in Hebrew they are from left to right as Yod-He(y)- Waw of -- Yod-He(y)-Waw-Shin-Ayin= Yahu'shua.
Then , when you look at the first 3 letters of the Hebrew number 3068= =YHWH or the Tetragrammaton that is also read from right to left in Hebrew you get from left to right Yod-He(y)-Waw of-- Yod-He(y)-Waw-He(y)== Yahuweh or Yahweh
Do you see what I see ? We have the first 3 letters read from right to left of 3091== , the Hebrew in Messiah's Name as "" Yod-He(y)-Waw -- from Yod-He(y)-Waw-Shin-Ayin= Yahu'shua "" is the same first 3 letters that is in the Tetragrammaton of YHWH of the Father of "" Yod-He(y)-Waw-- from -Yod- He(y)-Waw-He(y)== YHWH= Yahuweh or Yahweh.
Here now you have both the Father YHWH= Yahweh's Name known even in pronounciation, and the true correct Name of the Son our Redeemer Yahu'shua Messiah.
The Father YHWH = Yahweh is Yod-He(y)-Waw-He(y), and the Son Yahu'shua Messiah is Yod-He(y)-Waw-Shin-Ayin
Or, pronounced Yoth-Hey- Waw-Hey =YHWH.
The Yeh prefix is at the beginning of many names, and it sure does confuse people too.
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=Yeh
However, scroll down at this link and you will see Hebrew number 3068 of.
3068 Yhovah yeh-ho-vaw' from 1961; (the) self-Existent or Eternal; Jehovah, Jewish national name of God:--Jehovah, the Lord. Compare 3050==, with 3069.
Also you will see 3069 of... .."""3069 Yhovih yeh-ho-vee' a variation of 3068== (used after 136, and pronounced by Jews as 430, in order to prevent the repetition of the same sound, since they elsewhere pronounce 3068= as 136= lord ):--God """
And as you can see from this Strongs Lexicon, and scroll down you will find that this " yeh " is at the beginning of many names.
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=Yeh
Then, you can compare and notice 3050= = Yah=Yaw in the beginning and ending of 3068 of... """3068== Yhovah yeh-ho-vaw' from 1961; (the) self-Existent or Eternal; Jehovah, Jewish national name of God:--Jehovah, the Lord.( NOTICE) Compare 3050== , with 3069 """.
Then, when you do a search of 3050= =Yah= yaw -you will also see this prefix at the end of many names too at...
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=3050
And yaw of """ 274 'Achazyah akh-az-yaw' or (prolonged) rAchazyahuw {akh-az-yaw'-hoo}; from 270 and 3050== ; Jah has seized; Achazjah, the name of a Jewish and an Israelite king:--Ahaziah """ and """281 'Achiyah akh-ee-yaw or (prolonged) pAchiyahuw {akh-ee-yaw'-hoo}; from 251 and 3050= = ; brother (i.e. worshipper) of Jah; Achijah, the name of nine Israelites:--Ahiah, Ahijah """.
And yah = of """ as examples of " yaw " at...
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=yaw
And yah of """ 3470 Ysha`yah yesh-ah-yaw' or Yshayahuw {yesh-ah-yaw'-hoo}; from 3467 and 3050== ; Jah has saved; Jeshajah, the name of seven Israelites:--Isaiah, Jesaiah, Jeshaiah """ AND """3460 Yishma`yah yish-mah-yaw' or Yishmacyahuw {yish-mah-yaw'-hoo}; from 8085 and 3050== ; Jah will hear; Jishmajah, the name of two Israelites:--Ishmaiah. at """..
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=yah
""" Then, you can see 3069 is spoken with the added vowel points of 136=' lord ' and 430= ' god ' so as to 3069 Yhovih yeh-ho-vee' a variation of 3068== (used after 136, and pronounced by Jews as 430, in order to prevent the repetition of the same sound, since they elsewhere pronounce 3068== as 136):--God. """
Then, back to 3068 of """3068== Yhovah yeh-ho-vaw' from 1961; (the) self-Existent or Eternal; Jehovah, Jewish national name of God:--Jehovah, the Lord. Compare 3050==, and 3069 """.
See also these same findings here..
The key word name of " Yah= 3050= = Yaw " on pages 47-48 of the reprinted Edition, 1985 of Strongs Exaustive concordance Hebrew Dictionary will prove THE BEGINNING PREFIX of 'yeh " of """ 3050 = Yahh, yaw , contraction for 3068== , and meaning the same; Jah, the sacred( saving) name:--Jah, the Lord, most vehement. ( Compare names in "-iah," "- jah. == )""".
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=3050
See also here.... http://bible.crosswalk.com/Lexicons/OldTestamentHebrew/heb.cgi?search=3050&version=kjv&type=eng&submit=Find
Then, when you look at 3091 of of Messiah's Name of """ Yhowshuwa` yeh-ho-shoo'-ah or Yhowshua {yeh-ho-shoo'-ah}; from 3068 and 3467; Jehovah-saved; Jehoshua (i.e. Joshua), the Jewish leader:--Jehoshua, Jehoshuah, Joshua. Compare 1954, 3442 """.
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=3091
Here you can see the same beginning prefix of " yeh ", and this 3091= is from 3068= and 3467.
Of """3068 == Yhovah yeh-ho-vaw' from 1961; (the) self-Existent or Eternal; Jehovah, Jewish national name of God:--Jehovah, the Lord. Compare 3050== , and 3069
Again, 3068 which should have the beginning prefix of " Yah " as from 3050 = as we have shown above.
Then, 3467 of ...[quote]3467 yasha` yaw-shah' a primitive root; properly, to be open, wide or free, i.e. (by implication) to be safe; causatively, to free or succor:--X at all, avenging, defend, deliver(-er), help, preserve, rescue, be safe, bring (having) salvation, save(-iour), get victory. """
Again you see the " yaw = Yah== " in this prime root word which means defend, deliver, help, preserve, rescue, be safe, bring or having salvation, save
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=3467
Then the number 1954 of """ 1954 Howshea` ho-shay'-ah from 3467; deliverer; Hoshea, the name of five Israelites:--Hosea, Hoshea, Oshea.
3091 Yhowshuwa` yeh-ho-shoo'-ah or Yhowshua {yeh-ho-shoo'-ah}; from 3068== and 3467; Jehovah-saved; Jehoshua (i.e. Joshua), the Jewish leader:--Jehoshua, Jehoshuah, Joshua. Compare 1954, 3442 """
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=1954
Then, number 3442 of " 3091= Yhowshuwa` yeh-ho-shoo'-ah or Yhowshua {yeh-ho-shoo'-ah}; from 3068== and 3467; Jehovah-saved; Jehoshua (i.e. Joshua), the Jewish leader:--Jehoshua, Jehoshuah, Joshua. Compare 1954, 3442.
3442 Yeshuwa` yay-shoo'-ah for 3091= he will save; Jeshua, the name of ten Israelites, also of a place in Palestine:--Jeshua.
http://www.eliyah.com/cgi-bin/strongs.cgi?file=hebrewlexicon&isindex=3442
Notice this name again points you back, and is for 3091 which uses the beginning prefix of " Yeh " which is " Yah "= " " , as we have already shown above.
Not only does the endings of names with " = yaw = yah " proves this to be correct, but also the beginning prefixes of names with " yeh " will prove this correct also.
So YAHUWEH and YAHU'SHUA as BOTH the beginning prefix of " yeh " is " yaw= Yah == ", and as is the ending prefixes of " == yaw= yah " or " yah" is used 49 times in scriptures as the short poetic form, and neither Mosheh ( Exodus 15:2 ) and King David was never rebuked for using this short poetic form Name of Yahweh in the scriptures either was they ?
Also both 3068 of and 3091 of have the first 3 letters of the Tetragrammaton of YHWH = " Yod- He(y)- Waw " as is read from left to right, or right to left as " waW-(y)eH- doY ", pronounced as YAHUWEH =Yahweh for short in correct transliteration into English, or Yod--He(y)--Waw( ancient or Vav modern)-- He(y) in Hebrew.
If the Messiah's Name is " YEH " as in " Yeshua " then, why does BOTH the Father's Name and the SON have " YAH ( Strongs 3050) " in the beginning of both Names ? Please NOTICE that BOTH Names in Hebrew have " THE SAME FIRST 3 LETTERS " of the Tetragrammaton of " Yoth-He(y)-Waw ". This cannot be denied in the Hebrew, and neither by consulting a Strongs Concordance or Lexicon.
Why is it, people don't NOTICE the " FIRST 3 HEBREW LETTERS " in BOTH the Father " YAHU-WEH " and Messiah of " YAHU-SHUA as in the Tetragrammaton of " Yod-He(y) Waw " is in BOTH Hebrew Names , if Messiah's Name was " Yeh" as in " Yeshua " , then why does the Father's name begin with " YAH= Strongs 3050 " , and does not use the "Yeh " ?
Yahuweh = Yahweh bless,
Elijah ( Eliyah ) Collette