Cognomen ไออุ่น (Warm 
, ไออุ่น) , around the world, is quite a rare last name. The cognomen ไออุ่น is habitual in Denmark, where it is quite a rare surname, Germany, where it is a rare surname, and Myanmar. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Myanmar. Likewise, ไออุ่น is the forename as well as the last name.