Proper personal name: Yitsḥaq (commonly rendered 'Isaac'), the son of Abraham and Sarah, whose birth was associated with the motif of laughter. The principal lexical meaning arises from its root, denoting 'he laughs' or 'he will laugh.' While the base meaning refers directly to laughter, in the naming context it denotes the individual's identity, not an abstract concept. Semantic range is limited as a proper name but draws on the underlying verb meaning of joyful laughter or astonishment.