adjective

1. derived from the name of a father or ancestor
2. showing such descent a patronymic suffix

Etymology: LL patronymicus < Gr patrōnymikos < patēr, father + onyma, name

noun

1. a name showing descent from a given person as by the addition of a prefix or suffix (Ex.: Stevenson, son of Steven; O'Brien, descendant of Brien; Ivanovna, daughter of John, used in Russ. after the first name)
2. a family name; surname