Surname หยั่น (Yan 
, หยั่น) , all around the world, is a prevalent cognomen. The surname หยั่น is habitual in Myanmar, where it is a widespread surname, Cayman Islands, where it is a common surname, and Hong Kong (explore the name in all countries). Measured by absolute frequency, it is commonest in China, Myanmar, and Malaysia. Very seldom, หยั่น is the forename as well as the last name.