Jah

A Hebrew contraction for JEHOVAH, Psalms 68:4. It is often found in Hebrew compound words, as in Adonijah, Malachia, Hallelujah.

Source: ATS Bible Dictionary
Jah

A contraction for Jehovah (Psalms 68:4).

Source: Easton's Bible Dictionary
Jah

JAH, n. Jehovah.

Source: King James Dictionary
Jah

(Jehovah ), the abbreviated form of Jehovah, used only in poetry. It occurs frequently in the Hebrew, but with a single exception, (Psalms 68:4) is rendered "Lord" in the Authorized Version. The identity of Jah and Jehovah is strongly marked in two passages of Isaiah-- (Isaiah 12:2; 26:4) [JEHOVAH].

Source: Smith's Bible Dictionary