Where does “tisres” come from?

tisres (Proto-Celtic) comes from Proto-Indo-European tisres, from Proto-Indo-European trisres, from Proto-Indo-European tréyes — three.

Ancestry of “tisres”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeantisresfeminine nominative/vocative of *tréyes
2Proto-Indo-Europeantrisres—
3Proto-Indo-Europeantréyesthree

Words derived from “tisres”

Every word from Proto-Indo-European tréyes →Every word from Proto-Indo-European trisres →Every word from Proto-Indo-European tisres →