Where does “Isojoki” come from?

Isojoki (Finnish) comes from Finnish iso, from Finnish isä, from Proto-Finnic icä, from Proto-Uralic ićä — father.

Ancestry of “Isojoki”, step by step

Isojoki traces back through two separate lines of ancestry.

via Finnish iso

StepLanguageWordMeaning
1Finnishisobig; large; great
2Finnishisäfather; Father
3Proto-Finnicicäfather
4Proto-Uralicićäfather

via Finnish joki

StepLanguageWordMeaning
1Finnishjokiriver
2Finnishsokeusblindness
3Finnishsokeablind
4Proto-Finnicsokedablind

Words derived from “Isojoki”

Every word from Proto-Uralic ićä →Every word from Proto-Finnic icä →Every word from Finnish isä →