Where does “thritien” come from?

thritien (Old Dutch) comes from Proto-Germanic þritehun, from Proto-Germanic tehun, from Proto-Indo-European déḱm̥t — ten.

Ancestry of “thritien”, step by step

StepLanguageWordMeaning
1Proto-Germanicþritehunthirteen
2Proto-Germanictehunten
3Proto-Indo-Europeandéḱm̥tten

Words derived from “thritien

Every word from Proto-Indo-European déḱm̥tEvery word from Proto-Germanic tehunEvery word from Proto-Germanic þritehun