Surname Mcgrattan (Mcgrattan 
) , all around the world, is a rare cognomen. The last name Mcgrattan is characteristic of Ireland, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand. In absolute terms, it is commonest in the United Kingdom, the United States, and Ireland.
| VARIANT | COUNTRY |
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| Mcgrattan | Australia, Canada, Ireland, United Kingdom, United States |
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william terrence mcgrattan Canadian Catholic bishop, CA (b. 1956) |
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| tom mcgrattan Canadian ice hockey player, CA (b. 1927) |
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brian mcgrattan Canadian ice hockey player, CA (b. 1981) |
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| brian mcgrattan New Zealand rugby union player, NZ (b. 1959) |
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| ellen r. mcgrattan American economist (b. 1962) |
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| gerard mcgrattan Irish hurler, GB (b. 1972) |
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| paul mcgrattan IE (b. 1967) |
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| johnny mcgrattan Irish hurler, GB (b. 1977) |
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| hugh m. mcgrattan person who owned merchant ships, GB |
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| paddy mcgrattan Northern Irish election candidate |
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| katlyn mcgrattan researcher |
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| andrea m mcgrattan researcher (ORCID 0000-0003-1521-213X) |
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| kevin mcgrattan Ph.D. New York University 1991 |
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