Where does “Jetro” come from?

Jetro (Portuguese) comes from Latin Iethro, from Hebrew יִתְרוֹ — Jethro.

Ancestry of “Jetro”, step by step

Step	Language	Word	Meaning
1	Latin	Iethro	—
2	Hebrew	יִתְרוֹ	Jethro

Jetro — Etymology, Origin & Word History | Etymology Explorer