Where does “trizek” come from?

trizek (Breton) comes from Breton tri, from Middle Breton try, from Old Breton tri, from Proto-Brythonic tri, from Proto-Celtic trīs, from Proto-Indo-European *tréyes.

trizek (Breton): thirteen

Definitions

thirteen

Ancestry of “trizek”, step by step

trizek traces back through two separate lines of ancestry.

via Breton tri

Step	Language	Word	Meaning
1	Breton	tri	three
2	Middle Breton	try	—
3	Old Breton	tri	—
4	Proto-Brythonic	tri	three
5	Proto-Celtic	trīs	three
6	Proto-Indo-European	*tréyes	—

via Breton dek

Step	Language	Word	Meaning
1	Breton	dek	ten
2	Middle Breton	dek	—
3	Old Breton	dec	—
4	Proto-Brythonic	deg	ten
5	Proto-Celtic	dekam	ten
6	Proto-Indo-European	déḱm̥	ten

Words derived from “trizek”

trizeksilabennek

Every word from Proto-Indo-European *tréyes →Every word from Proto-Celtic trīs →Every word from Proto-Brythonic tri →