patronymic (n.)
1610s, from Late Latin patronymicum, from neuter of patronymicus "derived from a father's name," from patronymos "named from the father," from pater (genitive patros) "father" (see father (n.)) + onyma "name," Aeolic dialectal variant of onoma "name" (see name (n.)). As an adjective from 1660s.