Cognomen Deuan (Deuan 
, Deduan 
) , in the entire world, is a rare family name. The surname Deuan is characteristic of South-eastern Asia, particularly Laos, where it is quite a rare surname, Malaysia, where it is a very rare surname, and Philippines, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Laos, Malaysia, and India. More frequently, Deuan is the forename as well as the last name.