n. & v.
n. 1 a hereditary name common to all members of a family, as distinct from a Christian or first name. 2 archaic an additional descriptive or allusive name attached to a person, sometimes becoming hereditary.
v.tr. 1 give a surname to. 2 give (a person a surname). 3 (as surnamed adj.) having as a family name.
[ ME, alt. of surnoun f. AF (as SUR-(1), NOUN name) ]