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Family name Unguis (Ungo , Unguis ) , in all the world, is a rare surname. The family name Unguis is habitual in Latin America and the Caribbean, particularly El Salvador, where it is quite a rare surname, Uruguay, and Panama. Not in comparison with a country's population, it is the most numerous in El Salvador, Tanzania, and Uruguay. Likewise, Unguis is the forename as well as the last name.