• sirname,
• surename,
• surnam,
• surname,
• sur name,
• sirnname,
• sir name,
• aur name,
• zur name,
• xur name,
• dur name,
• eur name,
• wur name,
• syr name,
• shr name,
• sjr name,
• s8r name,
• s7r name,
• sue name,
• sud name

The adjective form of the word "sur name" is "surnamed".

The plural form of the word "sur name" is "sur names"

The singular form of the word "sur name" is "surname"