Cognomen Neptune (เกตุ 
, Neptune 
) , in the world, is quite a rare family name. The surname Neptune is characteristic of Latin America and the Caribbean, particularly Grenada, where it is quite a common surname, Trinidad and Tobago, and Saint Lucia. Not in comparison with a country's population, the name is most common in the United States, Haiti, and Trinidad and Tobago. Also, Neptune is the forename as well as the last name.
| VARIANT | COUNTRY |
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| เกตุ | Thailand |
| Neptune | Thailand, Haiti, Trinidad and Tobago, Democratic Republic of the Congo, United States |
Нептуне, เกตุกัน, เกตุค้างพลู, เกตุบรรลุ, เกตุประกอบ, เกตุมา, เกตุอยู่, and เนปจูน
| neptune blood Irish Anglican priest (1655-1716) (b. 1655) |
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| neptune blood (1682-1683) (b. 1682) |
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| neptune blood (1693-1700) (b. 1693) |
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| francis joseph neptune US (b. 1735) |
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| old john neptune Penobscot leader (b. 1767) |
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neptune small American slave (b. 1831) |
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| neptune blood (born 1791) (b. 1791) |
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| neptune blood (1792-1822) (b. 1792) |
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| neptune blood (1801-1865) (b. 1801) |
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| neptune blood-smyth (born 1804) (b. 1804) |
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| neptune william blood (1853-1920) (b. 1853) |
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| neptune richard trousdell (1855-1915) (b. 1855) |
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| neptune fitzgerald blood (1856-1902) (b. 1856) |
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| neptune francis christoe (b. 1858) |
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| mary mae neptune prof. of English, Spelman College (b. 1872) |
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