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Family name Soiko (Сойко , Soiko , Соико ) , globally, is quite a rare cognomen. The cognomen Soiko is characteristic of Belarus, where it is quite a rare surname, Ukraine, and Kyrgyzstan, where it is a rare surname. Not in comparison with a country's population, it is commonest in Eastern Europe, particularly Ukraine, Belarus, and Russia. Very seldom, Soiko is the forename as well as the last name.