Definition: A patronym is a type of family name that comes from the name of your fatheror a maleancestor. Thisnameoftenincludes a specialaddition, called an affix, suchas "-son" in Englishor "O'-" in Irish.
Noun
a family namederived from name of your fatheror a paternalancestor(especially with an affix (suchas -son in Englishor O'- in Irish) added to the name of your fatheror a paternalancestor)