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In the entire world, Ryū (Ryu , 龍 , Рю ) is quite a common dominantly male, but uncommonly feminine first name. The given name Ryū is characteristic of Indonesia, where it is quite a rare mostly male, but infrequently female name, Hong Kong, where it is quite a rare male name, and South Korea, where it is a rare feminine name. Not in comparison with a country's population, it is the most numerous in Indonesia, China, and Japan. Likewise, Ryū is the last name as well as the forename.
Ryū is also a name for the fictitious and mythical characters: Ryu , the Street Fighter character, Wreck-It Ralph; Ryū Lion , the fictional character from Is It Wrong to Try to Pick Up Girls in a Dungeon?; Ryu Hayabusa , the fictional character from Ninja Gaiden and Dead or Alive, Dead or Alive 5 Last Round; Ryu Jose , the fictional character from Mobile Suit Gundam and Ryu Shizuka , the Bakuman character, among other works.