Where does “Dobroiu” come from?

Dobroiu (Romanian) comes from Romanian -oiu, from Romanian -oi, from Latin -oneus.

Ancestry of “Dobroiu”, step by step

Step	Language	Word	Meaning
1	Romanian	-oiu	suffix forming many Romanian surnames
2	Romanian	-oi	augmentative suffix, used to indicate a larger...
3	Latin	-oneus	—