Where does “Hautajoki” come from?

Hautajoki (Finnish) comes from Finnish joki, from Finnish sokeus, from Finnish sokea, from Proto-Finnic sokeda — blind.

Ancestry of “Hautajoki”, step by step

Hautajoki traces back through two separate lines of ancestry.

via Finnish joki

StepLanguageWordMeaning
1Finnishjokiriver
2Finnishsokeusblindness
3Finnishsokeablind
4Proto-Finnicsokedablind

via Finnish hauta

StepLanguageWordMeaning
1Finnishhautagrave, tomb; trench; kiln, in the compound term...
2Proto-Germanicsauþazboiling; seething; wellspring; fountain; source;...
3Proto-Indo-Europeanh₂sewt-to roil; to move about, roil, seethe
Every word from Proto-Finnic sokedaEvery word from Finnish sokeaEvery word from Finnish sokeus