7 letters · 9 points in Scrabble
noun the name used to identify the members of a family (as distinguished from each member's given name)
originInherited from Middle English surname, a partial calque of Old French surnum, surnoun (“surname; nickname”) (whence Middle English surnoun), from Late Latin supernōmen, suprānōmen (“surname”), from super- (“over, above, beyond”) and nōmen (“name”), equivalent to sur- + name.
Etymology from Wiktionary, CC BY-SA 3.0