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Family name Isidoro (Isidoro , יצחק , Исидор ) , across the world, is a common surname. The surname Isidoro is habitual in Israel, where it is quite a common surname, Spain, and Mexico (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Mexico, Spain, and Brazil. Also, Isidoro is the forename as well as the last name.