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In the entire world, Rej (レイ , ري , Rej , among others...) is quite a rare gender-neutral given name. The forename Rej is habitual in Albania, where it is quite a rare male name, Saudi Arabia, where it is a rare gender-neutral name, and Sudan. In absolute terms, it is the most numerous in Egypt, Saudi Arabia, and Sudan. More frequently, Rej is the last name as well as the forename.
Rej is also a prevalent name for the fictitious and mythical characters: Rei Ayanami , the fictional character in the media franchise Neon Genesis Evangelion; Sailor Mars , the fictional character from Sailor Moon; Ray Palmer , the fictional character from the television series Arrow and Legends of Tomorrow, The Flash; Rej , the operatic character in the opera Der Bettelstudent and Atom , the fictional character, a superhero that appears in comic books published by DC Comics, The Flash, and in many other works.