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Last name Gini (Gini , Guinea , 吉尼 ) , worldwide, is a common family name. The cognomen Gini is characteristic of Paraguay, where it is quite a common surname, Equatorial Guinea, and Papua New Guinea, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Italy, Guatemala, and Paraguay. Likewise, Gini is the forename as well as the last name.