pat·ro·nym·ic 
(păt′rə-nĭmĭk)
(păt′rə-nĭmĭk)adj.
Of, relating to, or derived from the name of one's father or a paternal ancestor.
n.
A name so derived.
[Late Latin patrōnymicus, from Greek patrōnumikos, from patrōnumos, named after one's father : patēr, patr-, father + onuma, name; see n-men- in the Appendix of Indo-European roots.]
pat′ro·nymi·cal·ly adv.