Definitions
1.nounAn additional name, particularly those derived from a birthplace, quality, or achievement; an epithet.
2.nounAn additional name given to a person, place, or thing; a byname or nickname.
3.nounThe name a person shares with other members of that person's family, distinguished from that person's given name or names; a family name.
4.noun(Classical studies) The cognomen of Roman names.
5.nounA clan.
6.verbTo give a surname to.
7.verbTo call by a surname.