The Collaborative International Dictionary of English v.0.48:

Yahweh \Yah"weh\ (y[aum]"w[e^]), Yahwe \Yah"we\, prop. n. Also
Jahveh \Jah"veh\ (y[aum]"w[e^]), Jahve \Jah"ve\, Yahve \Yahve\,
Yahveh \Yahveh\, etc.
   A modern transliteration of the Hebrew word translated
   Jehovah in the Bible; -- used by some critics to
   discriminate the tribal god of the ancient Hebrews from the
   Christian Jehovah. Yahweh or Yahwe is the spelling now
   generally adopted by scholars.

   Syn: Yahwe, Yahveh, Wahvey, Jahve, Jahveh, Jahvey, Jahweh,
        Jehovah.
        [Webster 1913 Suppl. +WordNet 1.5 +CM] Jahvism

WordNet (r) 3.0 (2006):

Yahweh
    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]