Family name 克用 (Keyong 
, 克用 ) , throughout the world, is a rare surname. The cognomen 克用 is characteristic of South-eastern Asia, particularly Malaysia, where it is a rare surname, Thailand, and Indonesia, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in China, Malaysia, and Thailand. Much more frequently, 克用 is the forename as well as the last name.