Cognomen เอิ้น (Oen 
, เอิ้น) , throughout the world, is quite a common last name. The cognomen เอิ้น is habitual in Norway, where it is quite a rare surname, Indonesia, and Singapore, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Indonesia, the United States, and Norway. Much less frequently, เอิ้น is the forename as well as the last name.