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

Step	Language	Word	Meaning
1	Old Norse	nítján	nineteen
2	Proto-Germanic	newuntehun	nineteen
3	Proto-Germanic	tehun	ten
4	Proto-Indo-European	déḱm̥t	ten

nittān — Etymology, Origin & Word History | Etymology Explorer