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Last name Shallow (Shallow ) , worldwide, is quite a rare cognomen. The cognomen Shallow is characteristic of Latin America and the Caribbean, particularly Saint Vincent and the Grenadines, where it is a common surname, Barbados, where it is quite a common surname, and Trinidad and Tobago, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Saint Vincent and the Grenadines. Much less frequently, Shallow is the forename as well as the last name.