I.B.S.A. International Bible Students Association with C.T.Russell as their founder and his successor J.F.Rutherford who then changed their name to what he termed a more Biblical name to Jehovah`s Witnesses quoting Isa.43 :10-12..
Most likely little did he know back then that it was a Catholic Spanish Monk of the 13th Century that came up with the name Jehovah when he used the four letters of the Hebrew Tetragrammaton and translated those four Hebrew letters into Latin ,then English with JHVH then inserting a few vowels came up with the name Jehovah.
So Jehovah`s Witnesses today are unknowingly worshiping a Catholic named God Jehovah .
When in reality the more correct translation of those 4 Hebrew letters of the Tetragrammaton would be Y H W H namely Yahweh .
As their was no "J" sounding name in Hebrew .