Where does “söster” come from?

söster (North Frisian) comes from Old Frisian swester, from Proto-Germanic swestēr, from Proto-Indo-European swésōr, from Proto-Indo-European su-h₁ésh₂-ōr, from Proto-Indo-European h₁ésh₂r̥ — blood.

söster (North Frisian): sister

Definitions

sister

Ancestry of “söster”, step by step

Step	Language	Word	Meaning
1	Old Frisian	swester	—
2	Proto-Germanic	swestēr	sister
3	Proto-Indo-European	swésōr	sister
4	Proto-Indo-European	su-h₁ésh₂-ōr	—
5	Proto-Indo-European	h₁ésh₂r̥	blood

Every word from Proto-Indo-European h₁ésh₂r̥ →

söster — Etymology, Origin & Word History | Etymology Explorer