In all the world, ディアン (Deanne 
, Diyan 
, ディアン 
) is a common dominantly female, but infrequently boy's first name. The first name ディアン is characteristic of Bulgaria, where it is quite a common male name, Australia, where it is quite a rare female name, and Barbados. Measured by absolute frequency, the name is most common in the United States, Indonesia, and Australia. Very seldom, ディアン is the last name as well as the forename.