Throughout the world, Onis (Onis 
, Онис 
, Onís 
) is a rare unisex first name. The forename Onis is characteristic of Nicaragua, where it is a rare predominantly boy's, but very seldom female name, the Dominican Republic, where it is a rare female name, and Romania, where it is a rare gender-neutral name. Measured by absolute frequency, it is the most numerous in Indonesia, the United States, and Nigeria. Likewise, Onis is the last name as well as the forename.