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Globally, Rejs (Reise , Rejs , Рей ) is a rare unisex first name. The given name Rejs is habitual in the Democratic Republic of the Congo, where it is a rare gender-neutral name, Brazil, where it is an extremely rare female name, and Russia, where it is an extremely rare mostly male, but uncommonly feminine name. Not in comparison with a country's population, the name is most common in the Democratic Republic of the Congo, China, and the United States. More frequently, Rejs is the last name as well as the forename.
Rejs is also a name for the fictitious and mythical characters: Rei Ayanami , the fictional character in the media franchise Neon Genesis Evangelion and Sailor Mars , the fictional character from Sailor Moon.