Throughout the world, 尔旦 (Erdan 
, 尔旦 
) is quite a rare predominantly male, but very infrequently girly given name. The forename 尔旦 is habitual in Montenegro, where it is quite a common male name, Turkey, where it is a rare principally boy's, but very infrequently girly name, and Philippines, where it is a very rare male name. Measured by absolute frequency, it is commonest in China, Turkey, and Philippines. Likewise, 尔旦 is the last name as well as the forename.