Apparently from Japanese 貴方 (anata, “you”) + -x̂ (absolutive suffix).[1]
anatax̂
- (Bering Island, hapax) Japanese person
- Synonyms: Yapuunax̂, Yapuunix̂
- ^ José Andrés Alonso de la Fuente (2015 August 12) “Bering Island Aleut anata-x̣ ‘Japanese’”, in Studia Orientalia Electronica[1], volume 107, →ISSN, pages 7-16.