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JAH. It is in Hebrew יה whence Maimonides calls it "the two-lettered name," and derives it from the tetragrammaton, of which it is an abbreviation. Others have denied this, and assert that Jah is a name independent of Jehovah, but expressing the same idea of the divine essenee. See Gataker, De Nom. Tetrag..
JEHOVAH. The incommunicable, ineffable name of God, in Hebrew יהוה, and called, from the four letters of which it consists, the tetragrammaton, or four-lettered name.