Where does “Tule” come from?

Tule (Portuguese) comes from Latin Thūlē, from Ancient Greek Θούλη — Thule.

Ancestry of “Tule”, step by step

Step	Language	Word	Meaning
1	Latin	Thūlē	—
2	Ancient Greek	Θούλη	Thule

Tule — Etymology, Origin & Word History | Etymology Explorer