Where does “Irulegui” come from?

Irulegui (Spanish) comes from Basque Irulegi, from Basque hiru, from Proto-Basque (h)iluŕ — three.

Ancestry of “Irulegui”, step by step

StepLanguageWordMeaning
1BasqueIrulegiA surname​; Irouléguy
2Basquehiruthree
3Proto-Basque(h)iluŕthree
Every word from Proto-Basque (h)iluŕ →Every word from Basque hiru →Every word from Basque Irulegi →