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Last name Fonseca (Fonseca , Фонсека , Fonsêca ) , in the world, is a widespread family name. The last name Fonseca is habitual in Cabo Verde, where it is a prevalent surname, Portugal, where it is a widespread surname, and Costa Rica, where it is a common surname (explore the name in all countries). In absolute terms, this name is the most popular in Latin America and the Caribbean, particularly Brazil, Colombia, and Mexico.