The term 'SMALLVILLE SURNAME' is a reference to the fictional town of Smallville, which is the setting of the television series of the same name. The crossword solutions for this term are 'LANG' and 'KENT', both of which are four letters long. The surname 'Lang' belongs to Martha Kent, the adoptive mother of Clark Kent, the main character of the show. The surname 'Kent' belongs to Clark himself. Both surnames are associated with the town of Smallville and the characters that inhabit it.