Cognomen ลูก (Luk 
, Boul 
, ลูก 
) , across the world, is a common last name. The surname ลูก is habitual in Hong Kong, where it is a common surname, Cayman Islands, and Bermuda, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Hong Kong, China, and the United States. Much less frequently, ลูก is the forename as well as the last name.