Where does “systerspråk” come from?
systerspråk (Swedish) comes from Swedish syster, from Old Swedish systir, from Old Norse systir, from Proto-Norse ᛊᚹᛖᛊᛏᚨᚱ, from Proto-Germanic swestēr, from Proto-Indo-European swésōr, from Proto-Indo-European su-h₁ésh₂-ōr, from Proto-Indo-European h₁ésh₂r̥ — blood.
systerspråk (Swedish): sister language
Ancestry of “systerspråk”, step by step