Where does “svigerinne” come from?
svigerinne (Norwegian Nynorsk) comes from Norwegian Nynorsk sviger-, from German schwieger-, from German Schwieger, from Middle High German swiger, from Old High German swigar, from Proto-West Germanic *swegru, from Proto-Germanic swegrō, from Proto-Indo-European sweḱrúh₂ — father-in-law.
svigerinne (Norwegian Nynorsk): a sister-in-law
Ancestry of “svigerinne”, step by step