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Family name Seales (Seales , Силс ) , in all the world, is quite a rare last name. The last name Seales is characteristic of Latin America and the Caribbean, particularly Saint Vincent and the Grenadines, where it is quite a common surname, Grenada, and Trinidad and Tobago (explore the name in all countries). Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Trinidad and Tobago.