Cognomen Castelot (Castelot 
) , all around the world, is a rare last name. The last name Castelot is habitual in France, where it is a rare surname, Madagascar, and Belgium. Measured by absolute frequency, the name is most common in France, Madagascar, and the United States. Very seldom, Castelot is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Castelot | China, Belgium, Madagascar, United States, France |
| françois jollivet de castelot French politician (1821-1854), FR (b. 1821) |
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| eloi castelot BE (b. 1844) |
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john j. castelot American priest, teacher and writer (b. 1916) |
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| gabrielle castelot Belgian poet and journalist (1888-1968), FR (b. 1888) |
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| andré castelot French historian and writer (1911-2004), FR (b. 1911) |
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| jacques castelot Belgian-French actor (1914-1989), FR (b. 1914) |
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Mr, Emma, Fred, Ines, Yann, Maria, Sarah, Susan, Andre, Agnã, Cathy, Bryan, Kevin, Denis, Debra, David, Gabin, Laura, Louis, Loïc, Lubov, James, Eric, Julie, Nino, Jean, Ms, Kim, Joe, Jim, Tom, Nil, Emy, Marc, Mary, Anne, Aude, Paul, Rick, Rita, Ruan, Dave, Gary, Gail, Lynn, Jane, John, Nina, and Jimmy