The Prose Edda 2.67

"Beside these there are those terms which men prefix to the names of men: we call such terms epithets of possession, or true terms, or surnames. It is an epithet of possession when one names a thing by its true name, and calls him whom one desires to periphrase Owner of that thing; or Father or Grandfather of that which was named; Grandsire is a third epithet. Moreover, a son is also called Heir, Heritor, Bairn, Child and Boy, Inheritor. A blood-kinsman is called Brother, Twin, Germane, Consanguine; a relation is also called Nephew, Kinsman, Kin, Kith, Friend, Kin-Stave, Descendant, Family-Prop, Family-Stem, Kin-Branch, Family-Bough, Offshoot, Offspring, Head-Tree, Scion. Kinsmen by marriage are further called Sib-folk, Minglers of Blood. A friend is called Counsel-Mate, Counsel-Giver, Adviser, Secret-Sharer, Converser, Bench-Fellow, Fondling, Seat-Mate; bench-fellow also means Cabin-Mate. A foe is called Adversary, Shooter Against One, Hater, Attacker, Scather, Slayer, Hard Presser, Pursuer, Overbearer.

"These terms we call epithets of possession; and so also if a man is known by his dwelling or his ship, which has a name of its own, or by his estate, when a name of its own is given to it.

"This we call true terms: to call a man Wise Man, Man of Thought, Wise in Speech, Sage in Counsel, Wealth Munificent, Not Slack, Endower, Illustrious One; these are surnames.