Cognomen Mcelrath (Mcelrath 
, Mac Giolla Riabhaigh) , throughout the world, is quite a rare family name. The family name Mcelrath is characteristic of the United States, where it is a rare surname, Canada, where it is a very rare surname, and the United Kingdom.
| john edgar mcelrath (2 Jan 1844 - certain 6 May 1907) (b. 1844) |
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| katharine mcelrath (29 Nov 1888 - certain 11 Mar 1984) (b. 1888) |
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| jean sybil mcelrath American journalist, US (b. 1917) |
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| ah quon mcelrath (b. 1915) |
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| hugh thomas mcelrath (b. 1921) |
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| damian mcelrath (b. 1928) |
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| julie mcelrath HIV researcher (b. 1951) |
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| rich mcelrath college basketball player (1979–1980) Utah State |
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| mike mcelrath college basketball player (1981–1981) Miami (OH) |
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| christopher mcelrath researcher |
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| karen mcelrath researcher |
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| thomas mcelrath Ph.D. University of Pennsylvania 1993 |
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| c.j. mcelrath college basketball player (2010–2011) Army |
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| constance mcelrath researcher |
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| thomas mcelrath US entomologist, US (b. 1989) |
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