Family name นวลประสิทธิ์ (นวลประสิทธิ์ 
, Nuamprasit) , throughout the world, is an extremely rare cognomen. The surname นวลประสิทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much less frequently, นวลประสิทธิ์ is the forename as well as the last name.