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According to a person from Maine, USA the name is Native American in origin and means 'Warrior'.
This showed up on a search of: meaning of the name 'Atreyu' done on bing! search engine on April 22, 2019.
This showed up on a search of: meaning of the name 'Atreyu' done on bing! search engine on April 22, 2019.
The origin of this name is Michael Ende’s book The Neverending Story. In that book he was orphaned and raised communally by his tribe, so his name, in the made-up language of The People of the Purple Buffalo is “son of all.” So it’s from a 1970’s novel and a made-up language