patronymic
pat.ro.nym.ic \.pa-tr*-'nim-ik\ n [LL patronymicum, fr. neut. of patronymicus of a patronymic, fr. Gk] patronymikos, fr. patronymia patronymic, fr. patr- + onyma name - more at NAME : a name derived from that of the father or a paternal ancestor usu. by th e addition of an affix - patronymic aj