כַּשְׂדַּי Kasday (H3779)

a Chaldaean or inhabitant of Chaldaea; by implication, a Magian or professional astrologer

Chaldean = "clod breakers" 1) the inhabitants of Chaldea, living on the lower Euphrates and Tigris 2) those persons considered the wisest in the land (by extension)

(Aramaic) corresponding to כַּשְׂדִּי (H3778);