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In all the world, Rossen (Ros , Rossen , Росен ) is a common gender-neutral forename. The first name Rossen is habitual in Brunei, where it is quite a common unisex name, Bulgaria, where it is quite a common male name, and Australia, where it is quite a rare girly name. Not in comparison with a country's population, this name is the most popular in Indonesia, India, and Australia. Likewise, Rossen is the last name as well as the forename.
Rossen is also a name for the fictitious and mythical characters: Ros Myers , the fictional character from Spooks and Ros , the Upin & Ipin animation characters.