Ingva why are you quoting things i already quoted? I know about that suffix, but i am wondering if that was the origin of the slavic ending, because in lots of other languages at that place you find word for land, area, territory. England, Inglaterra…


So old names had ska, sko basically meaning of, belongs to.

The suffix -ius is added to a noun to form an adjective indicating "made of" or "belonging to" that noun.