Name «Onatsko»

The name "Onatsko" is formed with the diminutive suffix -ko, originating from the Moldovan or Romanian name Opa, which is, in turn, a shortened form of the official name Ananias. Historical evidence of this name can be found in the Cossack registers of 1649, specifically in the documents of the Bila Tserka Poltava, where an individual named Onatsko Voloshyn is mentioned (RVZ 173).