Where does “ärkēr (in rhyme with mēr)” come from?

ärkēr (in rhyme with mēr) (Middle High German) comes from Latin arcus, from Latin solium, from Proto-Indo-European sodyom, from Proto-Indo-European sḗd- — to sit.

Ancestry of “ärkēr (in rhyme with mēr)”, step by step

Step	Language	Word	Meaning
1	Latin	arcus	arc, arch; bow; rainbow
2	Latin	solium	seat, chair; throne, chair of state, official...
3	Proto-Indo-European	sodyom	—
4	Proto-Indo-European	sḗd-	to sit

Words derived from “ärkēr (in rhyme with mēr)”

Erker
erkkeri
erkkeri-ikkuna

Every word from Proto-Indo-European sḗd- →Every word from Proto-Indo-European sodyom →Every word from Latin solium →