Cognomen Cosgriff (Cosgriff 
) , all around the world, is quite a rare surname. The last name Cosgriff is characteristic of Australia, where it is quite a rare surname, New Zealand, where it is a rare surname, and the United States. Measured by absolute frequency, it is the most numerous in the United States, Australia, and the United Kingdom.
| VARIANT | COUNTRY |
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| Cosgriff | New Zealand, Australia, United States, United Kingdom, Ireland |
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richard h. cosgriff Union Army Medal of Honor recipient (1845-1910), IE (b. 1845) |
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| joe cosgriff Australian rules footballer (b. 1913) |
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| walter e. cosgriff American banker, US (b. 1914) |
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| john w. cosgriff (b. 1931) |
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| eireann c. cosgriff researcher |
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| marg cosgriff researcher ORCID ID = 0000-0001-8649-8302 |
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| christopher vincent cosgriff researcher |
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| jack cosgriff story artist (active 1939-1961) |
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| rosemary ann cosgriff Peerage person ID=15062 |
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| jeff cosgriff American soccer player, US (b. 1987) |
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