Where does “Tiur” come from?

Tiur (Romanian) comes from Hungarian tűr, from Proto-Turkic döŕ- — to bear, endure, suffer.

Ancestry of “Tiur”, step by step

Step	Language	Word	Meaning
1	Hungarian	tűr	to endure, tolerate; to crumple, roll, roll up,...
2	Proto-Turkic	döŕ-	to bear, endure, suffer