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Last name Napier (Napier ) , throughout the world, is a common cognomen. The last name Napier is habitual in Aland Islands, where it is quite a common surname, Dominica, and Seychelles (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in the United States, the United Kingdom, and Australia. Much less frequently, Napier is the forename as well as the last name.