Where does “üheksas” come from?

üheksas (Estonian) comes from Proto-Finnic ükteksäc, from Proto-Finnic ükteksä, from Proto-Finnic ükci, from Proto-Uralic ükte — one.

üheksas (Estonian): ninth

Definitions

Step	Language	Word	Meaning
1	Proto-Finnic	ükteksäc	ninth
2	Proto-Finnic	ükteksä	nine
3	Proto-Finnic	ükci	one
4	Proto-Uralic	ükte	one

üheksas — Etymology, Origin & Word History | Etymology Explorer