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Cognomen Rej (レイ , ري , Rej , among others...) , in the entire world, is a common family name. The surname Rej is habitual in Japan, where it is quite a common surname, Iraq, where it is quite a rare surname, and Tunisia. Not in comparison with a country's population, the name is most common in Japan, India, and Egypt. Much less frequently, Rej is the forename as well as the last name.