Where does “Сава” come from?

Сава (Serbo-Croatian) comes from Ancient Greek Σάββας, from Aramaic סבא.

Ancestry of “Сава”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Σάββας	—
2	Aramaic	סבא	—

Сава — Etymology, Origin & Word History | Etymology Explorer