Cognomen 兰克 (Lanke 
, Rank , 兰克 
) , in the world, is a common surname. The family name 兰克 is characteristic of Estonia, where it is quite a common surname, Germany, where it is quite a rare surname, and El Salvador. Not in comparison with a country's population, it is commonest in India, Germany, and the United States. Much less frequently, 兰克 is the forename as well as the last name.