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All around the world, ソイ (Soi , ソイ) is quite a rare gender-neutral first name. The first name ソイ is characteristic of Macao, where it is quite a common epicene name, Japan, where it is a rare feminine name, and the Democratic Republic of the Congo. Not in comparison with a country's population, the name is most common in India, Japan, and Indonesia. Likewise, ソイ is the last name as well as the forename.
ソイ is also a name for the fictitious and mythical characters: Soi Fon , the fictional character from Bleach.