Where does “Björnsson” come from?

Björnsson (Icelandic) comes from Icelandic Björn, from Old Norse Bjǫrn, from Proto-Germanic bernuz — bear.

Ancestry of “Björnsson”, step by step

StepLanguageWordMeaning
1IcelandicBjörnbear mammal
2Old NorseBjǫrnbear (animal)
3Proto-Germanicbernuzbear
Every word from Proto-Germanic bernuz →Every word from Old Norse Bjǫrn →Every word from Icelandic Björn →