Old Portuguese irmão

← Proto-Indo-European *ǵénh₁mn̥ (derived)

← Proto-Indo-European *ǵenh₁- (mention)

← Latin germānus (inherited)

← Latin germen (mention)

← Old Spanish ermano (cognate)

← Old Leonese ermano (cognate)

→ Galician irmán (inherited)

→ Old Leonese ermano (cognate)