Family name Seaforth (Seaforth 
) , worldwide, is a rare last name. The surname Seaforth is characteristic of Trinidad and Tobago, where it is quite a rare surname, Kenya, where it is a rare surname, and Canada, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Kenya, the United States, and the United Kingdom. Very seldom, Seaforth is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Seaforth | United Kingdom, Trinidad and Tobago, United States, Kenya, Canada |
| charles henry seaforth British painter, engraver & publisher (b. 1801) |
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| seaforth simpson mackenzie (1883-1955) public servant (b. 1883) |
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| francis alan stewart-mackenzie of seaforth (1910-1943) (b. 1910) |
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| sydney seaforth Guyanese cricketer (b. 1933) |
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| c.j. seaforth college basketball player (2018–2018) Iona |
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Mr, Sarah, Shane, Simon, Sonia, Steve, Alice, Allan, Abdul, Akeno, Aisha, Ayana, Chana, Chris, Caden, Colin, Clive, Brian, Kayla, Keith, Merry, Zoya, Faye, Edna, Ms, Ava, Kia, Roy, Fay, Ula, Mark, Myca, Sian, Paula, Sean, Paul, Roni, Ryan, Gary, Lisa, Jair, John, Juan, Toya, Amma, and Robin