Where does “Petroi” come from?

Petroi (Romanian) comes from Romanian Petru, from Proto-Celtic *kʷetwores, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

Ancestry of “Petroi”, step by step

StepLanguageWordMeaning
1RomanianPetruPeter
2Proto-Celtic*kʷetworesfour
3Proto-Indo-Europeankʷetwóresfour
4Proto-Indo-Europeankʷe-and
Every word from Proto-Indo-European kʷe- →Every word from Proto-Indo-European kʷetwóres →Every word from Proto-Celtic *kʷetwores →