The meaning of Jahdai in the Bible
(From International Standard Bible Encyclopedia)

ja'-da-i, ja'-di (yahday, "Yah leads" (?); Baer reads yehday): In I Chronicles 2:47, where six sons of Jahdai are mentioned. "The name has been taken as that of another wife or concubine of Caleb; more probably Jahdai is a descendant of Caleb, whose name, in the original connection, has fallen from the text" (Curtis, Chronicles, 96).

See more on the meaning of Jahdai in the Bible:
Jahdai {Easton's Bible Dictionary}

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