The Collaborative International Dictionary of English v.0.48:

Jahweh \Jahweh\, Jahvey \Jahvey\n.
   a name for the Old Testament God as transliterated from the
   Hebrew YHVH. See Jehovah.

   Syn: Yahweh, Yahwe, Yahveh, Yahve, Wahvey, Jahweh, Jehovah.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Jahweh
    n 1: a name for the God of the Old Testament as transliterated
         from the Hebrew consonants YHVH [syn: Yahweh, YHWH,
         Yahwe, Yahveh, YHVH, Yahve, Wahvey, Jahvey,
         Jahweh, Jehovah, JHVH]