Jah'dai (Heb. Yahday', יָהדָּי, prob. grasper; Sept. Ι᾿αδαϊv), a descendant apparently of Caleb, of the family of Hezron; his sons' names are given, but, as his own parentage is not stated (1Ch 2:47), it can only be conjectured that lie was the son of the preceding Gazez, the son (different from the brother) of Haran (ver. 46). B.C. prob. post 1612. Various other suggestions regarding the name have been made, as that Gazez, the name preceding, should be Jahdai (Houbigant, ad loc.); that Jahdai was a concubine of Caleb (Grunenberg quoted by Michaelis, Adnof. ad loc.), etc.; but these are mere groundless suppositions (see Burrington, 1, 216; Bertheau, Comment. ad loc.).