Family name 葛兰 (Gülen 
, 葛兰 ) , all over the world, is a common last name. The cognomen 葛兰 is characteristic of Turkey, where it is quite a common surname, Denmark, where it is a rare surname, and Germany. Not in comparison with a country's population, this name is the most popular in Turkey, Germany, and China. Very seldom, 葛兰 is the forename as well as the last name.