Is Gil a Mexican last name?

Yes, Gil is a Mexican last name. It originated in Spain, where it is a patronymic surname derived from the personal name Gil, which is a short form of the Latin name Aegidius. The name Aegidius is derived from the Greek word aigis, meaning "shield" or "protection". In Mexico, the surname Gil is ranked 23rd in terms of frequency, with an estimated 1,160,141 people sharing this last name.