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Throughout the world, Eustaquia (Eustaquia ) is a common feminine forename. The first name Eustaquia is characteristic of Equatorial Guinea, where it is quite a common feminine name, Peru, where it is quite a rare feminine name, and Argentina. Not in comparison with a country's population, it is commonest in Philippines, Mexico, and Argentina. Much less frequently, Eustaquia is the last name as well as the forename.