Cognomen 란 (兰 
, Lan 
, 蘭 ) , in all the world, is a prevalent last name. The cognomen 란 is characteristic of Malaysia, where it is a common surname, Macao, and China, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in China, Malaysia, and Vietnam. Likewise, 란 is the forename as well as the last name.