ja'-na-i, ja'-ni (ya`nay, "he answers"; as to whether final "y" is the third radical (letter), or may be taken as equivalent to the Divine name Yah, see HPN, 149-51):

A chief of a family descended from Gad (1 Chronicles 5:12, the King James Version "Jaanai").

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'JANAI'". "International Standard Bible Encyclopedia". 1915.