Where does “Koskina” come from?

Koskina (Ingrian) comes from Ingrian koski, from Proto-Finnic koski, from Proto-Uralic kośke.

Ancestry of “Koskina”, step by step

StepLanguageWordMeaning
1Ingriankoskiwaterfall
2Proto-Finnickoskia continuous series of relatively small...
3Proto-Uralickośke—
Every word from Proto-Uralic kośke →Every word from Proto-Finnic koski →Every word from Ingrian koski →