Family name 贺兰 (Helan 
, 贺兰 , 하란 
) , in the world, is quite a common surname. The cognomen 贺兰 is characteristic of Czechia, where it is quite a rare surname, Kuwait, where it is a rare surname, and Iraq. Measured by absolute frequency, the name is most common in China, India, and France. More frequently, 贺兰 is the forename as well as the last name.