Where does “nittān” come from?

nittān (Old Swedish) comes from Old Norse nítján, from Proto-Germanic newuntehun, from Proto-Germanic tehun, from Proto-Indo-European déḱm̥t — ten.

Ancestry of “nittān”, step by step

StepLanguageWordMeaning
1Old Norsenítjánnineteen
2Proto-Germanicnewuntehunnineteen
3Proto-Germanictehunten
4Proto-Indo-Europeandéḱm̥tten
Every word from Proto-Indo-European déḱm̥t →Every word from Proto-Germanic tehun →Every word from Proto-Germanic newuntehun →