Where does “Guðmundsson” come from?

Guðmundsson (Icelandic) comes from Icelandic Guðmundur, from Old Norse Guðmundr, from Old Norse guð, from Proto-Germanic gudą, from Proto-Germanic gastiz, from Proto-Indo-European gʰóstis, from Proto-Indo-European -tis — Derives abstract/action nouns from verb roots.

Ancestry of “Guðmundsson”, step by step

StepLanguageWordMeaning
1IcelandicGuðmundur—
2Old NorseGuðmundr—
3Old NorseguðGod m; god, deity n
4Proto-Germanicgudąinvoked one; god, deity
5Proto-Germanicgastizstranger, guest
6Proto-Indo-Europeangʰóstisstranger, host
7Proto-Indo-European-tisDerives abstract/action nouns from verb roots
Every word from Proto-Indo-European -tis →Every word from Proto-Indo-European gʰóstis →Every word from Proto-Germanic gastiz →