Where does “Þorkelsson” come from?

Þorkelsson (Icelandic) comes from Icelandic Þorkell, from Old Norse Þorkell, from Old Norse Ketill, from Proto-Germanic katilaz, from Latin catīllus, from Latin -lus, from Proto-Italic -elos, from Proto-Indo-European -e-lós — Forms agent nouns from verbal roots.

Ancestry of “Þorkelsson”, step by step

StepLanguageWordMeaning
1IcelandicÞorkell
2Old NorseÞorkell
3Old NorseKetillkettle, cauldron
4Proto-Germanickatilazkettle, bucket, vessel
5Latincatīllussmall bowl, dish, or plate
6Latin-lusAlternative form of -ulus; diminutive suffix
7Proto-Italic-elosForms desubstantival and deadjectival diminutive nouns
8Proto-Indo-European-e-lós
9Proto-Indo-European-lósForms agent nouns from verbal roots
Every word from Proto-Indo-European -lósEvery word from Latin -lusEvery word from Latin catīllus