Family name Callendar (Callendar 
) , globally, is a rare last name. The last name Callendar is habitual in the United States, where it is a very rare surname, Australia, and Canada. In absolute terms, this name is the most popular in the United States, Canada, and Germany.
| VARIANT | COUNTRY |
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| Callendar | Germany, United Kingdom, Australia, United States, Canada |
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margaret callendar (1757-1815) (b. 1757) |
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| adam callendar (1748-1815) (b. 1748) |
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| lilla callendar (1787-1835) (b. 1787) |
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hugh longbourne callendar British physicist (1863-1930), GB (b. 1863) |
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george russell callendar Army Physician and General, US (b. 1884) |
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| guy stewart callendar British engineer, GB (b. 1898) |
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| colin bishop callendar GB (b. 1897) |
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| william dudley henry charles forbes of callendar (died 1977) |
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| jonathan f. callendar geologist |
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| nicola callendar Peerage person ID=278013 |
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| alexander callendar Peerage person ID=200182 |
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| william forbes of callendar Peerage person ID=608788 |
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| jason callendar |
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| christian de callendar |
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Mr, Jean, Tony, Tina, Neva, Earl, Irma, Marie, Maura, Sarah, Joan, Susan, Allen, Annie, Chris, Carla, Craig, Bella, Brian, Kelly, Kirby, Steve, Peter, John, Dale, Ann, Amy, Ray, Dan, Don, Leo, Lee, Jim, Ida, Gary, Mary, Mike, Chyp, Carl, Bart, Ross, Rory, Rick, Ruth, Ryan, Mark, and Rogan