Surname Cossar (Cossar 
) , globally, is quite a rare family name. The surname Cossar is habitual in Bermuda, where it is quite a common surname, Slovakia, where it is quite a rare surname, and New Zealand, where it is a rare surname. Measured by absolute frequency, it is commonest in the United Kingdom, Italy, and Australia. Very seldom, Cossar is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cossar | United Kingdom, Italy, Australia, United States, Democratic Republic of the Congo |
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john cossar actor (1858-1935), GB (b. 1858) |
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| george payne cossar American lawyer and politician, US (b. 1907) |
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| marcelo cossar Abogado y Político Argentino, AR (b. 1968) |
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| james william cossar Peerage person ID=598796 |
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| eric william thomson cossar (died 1945) |
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| james cossar Ph.D. University of Cambridge 1933 |
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| peter j cossar researcher |
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| agnes cossar Peerage person ID=131915 |
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| alan cossar |
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| mariángeles cossar Argentinian volleyball player, AR (b. 1990) |
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| roisin cossar |
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| rose cossar Canadian rhythmic gymnast, CA (b. 1991) |
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