Cognomen Mckiernan (Mckiernan 
) , worldwide, is quite a rare family name. The last name Mckiernan is habitual in Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom, where it is a rare surname. Not in comparison with a country's population, it is commonest in the United States, Ireland, and the United Kingdom.
| charles henry mckiernan American settler (b. 1825) |
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john s. mckiernan American judge, US (b. 1911) |
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david d. mckiernan United States general, US (b. 1950) |
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ruairí mckiernan Irish businessman, IE (b. 1977) |
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| michel a. mckiernan Ph.D. Illinois Institute of Technology 1956 (b. 1930) |
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| dennis l. mckiernan American writer, US (b. 1932) |
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ryan mckiernan American ice hockey player (1989-), US (b. 1989) |
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david mckiernan |
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| kevin mckiernan American journalist, US (b. 1944) |
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| jim mckiernan Australian politician, IE (b. 1944) |
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| gerald joseph mckiernan (b. 1942) |
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| sean mckiernan Irish traditional musician, US (b. 1953) |
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| catherina mckiernan Irish long-distance runner, IE (b. 1969) |
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| andrew j mckiernan Australian artist, AU (b. 1970) |
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| tawnia mckiernan television director, US |
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