Last name Killough (Killough 
) , across the world, is quite a rare cognomen. The cognomen Killough is habitual in the United States, where it is a rare surname, Canada, and New Zealand. In absolute terms, this name is the most popular in the United States, the United Kingdom, and Canada.
| VARIANT | COUNTRY |
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| Killough | Canada, Switzerland, United Kingdom, Sweden, United States |
| samuel b. killough (b. 1813) |
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| annette w. killough (b. 1821) |
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| hugh baxter killough (b. 1892) |
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| h. patrick killough US author (b. 1945) |
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| ann killough American writer, US (b. 1947) |
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| h. p. killough (b. 1945) |
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| bill killough college basketball player (1985–1986) Texas-Arlington |
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| john e. killough Ph.D. Rice University 1986 |
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| matthew killough Ph.D. New York University 1998 |
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| james m killough researcher |
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| d. brady killough Ph.D. University of Victoria 2009 |
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| mary killough |
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