Family name Killingsworth (Killingsworth 
) , throughout the world, is quite a rare surname. The last name Killingsworth is habitual in the United States, where it is quite a rare surname, Australia, where it is a rare surname, and New Zealand. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Canada.
| VARIANT | COUNTRY |
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| Killingsworth | United Kingdom, Canada, Australia, Italy, United States |
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jim killingsworth American basketball player and coach (1923-2007), US (b. 1923) |
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| edward a. killingsworth American architect, US (b. 1917) |
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| joann dean killingsworth American actress (1923-2015), US (b. 1923) |
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| charles killingsworth (b. 1917) |
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| mark r. killingsworth D.Phil. University of Oxford 1977, US (b. 1946) |
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| bryan a killingsworth researcher |
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| nicholas j. killingsworth Ph.D. University of California, San Diego 2007 |
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| cleve killingsworth businessperson, US |
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| charles c. killingsworth Ph.D. University of Wisconsin-Madison 1947 |
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| marvis killingsworth college basketball player (1985–1986) Nicholls State |
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| elizabeth k killingsworth researcher |
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| jake killingsworth college basketball player (2017–2020) Columbia |
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| marvin killingsworth college basketball player (1987–1987) Nicholls State |
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| matt killingsworth happiness researcher; designs studies that gather data on happiness |
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| marco killingsworth American basketball player, US (b. 1982) |
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