Throughout the world, Rias (Rias 
) is quite a rare unisex forename. The first name Rias is characteristic of Indonesia, where it is quite a rare gender-neutral name, United Arab Emirates, where it is a rare boy's name, and Qatar. Not in comparison with a country's population, it is the most numerous in Indonesia, Pakistan, and India. Also, Rias is the last name as well as the forename.
Rias is also a name for the fictitious and mythical characters: Rias Gremory , the fictional character from High School DxD.