Where does “dreizehen” come from?

dreizehen (Middle High German) comes from Old High German drīzehan, from Proto-Germanic þritehun, from Proto-Germanic tehun, from Proto-Indo-European déḱm̥t — ten.

Ancestry of “dreizehen”, step by step

Step	Language	Word	Meaning
1	Old High German	drīzehan	—
2	Proto-Germanic	þritehun	thirteen
3	Proto-Germanic	tehun	ten
4	Proto-Indo-European	déḱm̥t	ten

Every word from Proto-Indo-European déḱm̥t →

dreizehen — Etymology, Origin & Word History | Etymology Explorer