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Worldwide, Gilliam (Gilliam
) is a rare unisex first name. The given name Gilliam is characteristic of Cuba, where it is a rare girly name, Zimbabwe, and South Africa, where it is a rare principally male, but very seldom girly name. Measured by absolute frequency, it most frequently occurs in South Africa, the United States, and Cuba. Much more frequently, Gilliam is the last name as well as the forename.