Where does “sjoda” come from?

sjoda (Norwegian Nynorsk) comes from Old Norse sjóða, from Proto-Germanic seuþaną, from Proto-Indo-European h₂sewt- — to roil; to move about, roil, seethe.

Ancestry of “sjoda”, step by step

Step	Language	Word	Meaning
1	Old Norse	sjóða	to seethe, boil; cook; to forge; to brood over
2	Proto-Germanic	seuþaną	to seethe; boil
3	Proto-Indo-European	h₂sewt-	to roil; to move about, roil, seethe

Every word from Proto-Indo-European h₂sewt- →Every word from Proto-Germanic seuþaną →Every word from Old Norse sjóða →