Where does “Petreni” come from?

Petreni (Romanian) comes from Hungarian -eni, from Hungarian -é-, from Hungarian -d, from Middle Welsh -nt — 3rd person plural verb ending.

Ancestry of “Petreni”, step by step

StepLanguageWordMeaning
1Hungarian-eniUsed to form the infinitive; "For the other...
2Hungarian-é-—
3Hungarian-dyour; Used in the second-person singular definite...
4Middle Welsh-nt3rd person plural verb ending
Every word from Middle Welsh -nt →Every word from Hungarian -d →Every word from Hungarian -eni →