Cognomen Гулен (Gülen 
, Gulen 
, Goulen 
) , all over the world, is a common last name. The surname Гулен is habitual in Turkey, where it is quite a common surname, Malta, where it is quite a rare surname, and Denmark, where it is a rare surname. Not in comparison with a country's population, it is commonest in Turkey, Philippines, and Germany. Much less frequently, Гулен is the forename as well as the last name.