Cognomen อูน (Un 
, อูน 
, Oone 
) , in the entire world, is a common last name. The surname อูน is habitual in Macao, where it is a common surname, Malaysia, where it is quite a rare surname, and Albania. Measured by absolute frequency, the name is most common in Indonesia, Macao, and Malaysia. Also, อูน is the forename as well as the last name.