Using graphic elements like this world map, to see in which countries or regions of the world the surname Onuska is more common, is of great help.
The quantity of people with the surname Onuska that we can find in each country can help us discern the origin of the surname Onuska, as logic tells us that the place with the most people surnamed Onuska will be the country or area of origin of the surname Onuska.