Wiktionary
ancestral name
n. 1 A surname, particularly used in contexts where other surnames (such as patronymics or clan names) need to be distinguished 2 (context Sinology English) The ''姓'' surname in its ancient use where it was distinguished from the ''氏'' clan name, as opposed to its modern use as a simple surname
Usage examples of "ancestral name".
It would have been suffi-cient for Fingolfin to give to his eldest son a name beginning with fin-as an 'echo' of the ancestral name, and if this was also specially applicable it would have been approved as a good invention.