About the Koski surname
The surname Koski has a primarily toponymic formation. The surname ending is common in Slavic traditions and may indicate geographical or patronymic origin. In this type of surname, the name first located a person in relation to a place before becoming hereditary. Families bearing the same surname may nevertheless come from different places when more than one locality produced a similar name.
Pronunciation:
Kos-ki/kɔski/