Surname Mccosker (Mccosker 
) , in all the world, is quite a rare last name. The cognomen Mccosker is characteristic of Australia, where it is quite a rare surname, Ireland, where it is a rare surname, and New Zealand. Measured by absolute frequency, the name is most common in Australia, the United States, and the United Kingdom.
| VARIANT | COUNTRY |
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| Mccosker | Australia, Ireland, United States, United Kingdom, China |
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thomas mccosker American shipbuilder and politician, US (b. 1834) |
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| john mccosker American rower, US (b. 1910) |
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kim mccosker Australian author, AU |
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| john e. mccosker American oceanographer, US (b. 1945) |
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| rick mccosker Australian cricketer, AU (b. 1946) |
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| anthony mccosker researcher (b. 1974) |
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| laura k mccosker researcher (ORCID 0000-0001-9107-9401) |
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| kieren mccosker researcher |
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| dave mccosker college basketball player (1955–1956) Santa Clara |
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| chris mccosker researcher (ORCID 0000-0002-7160-2987) |
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| philip mccosker GB |
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