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Last name Onica (Onica
, Оника
, Оница
) , in the entire world, is quite a common surname. The cognomen Onica is characteristic of Moldova, where it is quite a common surname, Romania, and Italy, where it is a rare surname. Measured by absolute frequency, the name is most common in Romania, Moldova, and China. Also, Onica is the forename as well as the last name.