Cognomen Cosslett (Cosslett 
) , in the entire world, is a rare family name. The family name Cosslett is characteristic of Isle of Man, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand. Not in comparison with a country's population, it is commonest in the United Kingdom, South Africa, and the United States. Much less frequently, Cosslett is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cosslett | United Kingdom, Australia, South Africa, United States, New Zealand |
| william cosslett poet and colliery official, GB (b. 1831) |
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| cosslett รณ cuinn Translated the New Testament into Irish (1907-1995), GB (b. 1907) |
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| vernon ellis cosslett British physicist (1908-1990), GB (b. 1908) |
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| peter cosslett (b. 1927) |
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| andy cosslett British businessman, GB (b. 1955) |
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| allan cosslett researcher |
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| stephen r. cosslett Ph.D. University of Cambridge 1969 |
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| stephen rhys cosslett Ph.D. University of California, Berkeley 1979 |
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| mary goodrich cosslett |
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Mr, Jess, Jeff, Tony, Tess, Nick, Emma, Fran, Owen, Maria, Marie, Megan, Sarah, Susan, Steve, Allan, Anita, Abbie, Chris, Carol, Corey, Clare, John, Betty, Jada, Lori, Ms, Sam, Amy, Bev, Kim, Rob, Roy, Lee, Mark, Mike, Andy, Anna, Adam, Carl, Beth, Keri, Paul, Rory, Ryan, Dean, Dina, Jane, and Bonny