Jah

from The Collaborative International Dictionary of English v.0.48

Jah \Jah\ (j[aum]), n. [Heb. y[=a]h.]
   Jehovah. --Ps. lxviii. 4.
   [1913 Webster] Jahvist

from Easton's 1897 Bible Dictionary

Jah
a contraction for Jehovah (Ps. 68:4).

from Hitchcock's Bible Names Dictionary (late 1800's)

Jah, the everlasting

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