Cognomen ลั่น (Lan 
, ลั่น) , in the entire world, is a widespread surname. The cognomen ลั่น is habitual in Malaysia, where it is a common surname, Macao, and Vietnam, where it is quite a common surname (explore the name in all countries). In absolute terms, it most frequently occurs in China, Malaysia, and Vietnam. Very seldom, ลั่น is the forename as well as the last name.