Surname Calnan (Calnan 
) , across the world, is quite a rare last name. The last name Calnan is habitual in Bermuda, where it is quite a rare surname, Ireland, and New Zealand, where it is a rare surname. In absolute terms, it is commonest in the United States, the United Kingdom, and Ireland.
| VARIANT | COUNTRY |
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| Calnan | United Kingdom, United States, Ireland, Australia, Canada |
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patrick joseph calnan politician in Massachusetts, US (1847-1904), US (b. 1847) |
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george calnan US navy officer and fencer, US (b. 1900) |
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| joseph calnan New Zealand rugby union player (1876-1947), NZ (b. 1876) |
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| clem calnan English cricketer (1888-1974), GB (b. 1888) |
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| thomas d. calnan British aviator (1915-1981), GB (b. 1915) |
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| john calnan American comics artist, US (b. 1932) |
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| michael david calnan Canadian politician, CA (b. 1932) |
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| peter david calnan Peerage person ID=197881, GB (b. 1937) |
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| michael calnan (b. 1949) |
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| daniel calnan researcher ORCID ID = 0000-0003-4615-9925 |
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| eleanor calnan American suffragist, US |
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| m calnan researcher |
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| cecile marie calnan Peerage person ID=569496 |
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| mark david calnan Peerage person ID=197883 |
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| alexander james calnan Peerage person ID=197885 |
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