patronymic
Concise Oxford English Dictionary © 2008 Oxford University Press:
patronymic /ˌpatrəˈnɪmɪk/
▶noun a name derived from the name of a father or ancestor, e.g. Johnson, O'Brien, Ivanovich.
– origin C17: via late L. from Gk patrōnumikos, from patrōnumos, from patēr, patr- ‘father’ + onoma ‘name’.
'patronymic' also found in these Oxford entries:
