They're not given

Usage examples of surnames.

He had worked until late in the night at HQ and all that morning, setting up the Identicast of Blofeld, checking details with Ronnie Vallance, fixing up the private, the Munich side of his life, chattering on the teleprinter to Station Z, even remembering to tell Mary Goodnight to get on to Sable Basilisk after the holiday and ask him to please do some kind of a job on the surnames of the ten girls and please to have the family tree of Ruby Windsor embellished with gold capitals.

Jewish immigrants whose actual surnames were difficult for Englishmen to pronounce or spell.

Alastair, a Craig, a Timothy, and a Graham, three with hyphenated surnames, the fourth with a III suffix.