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Globally, Oignon (Ui , Agnon , Oignon ) is quite a rare gender-neutral first name. The forename Oignon is habitual in Nigeria, where it is a rare primarily masculine, but scarcely feminine name, Saudi Arabia, where it is a rare unisex name, and Israel, where it is a rare masculine name. Not in comparison with a country's population, it is commonest in India, Nigeria, and China. Likewise, Oignon is the last name as well as the forename.
Oignon is also a name for the fictitious and mythical characters: Ui Hirasawa , the fictional character from K-On!.