Cognomen Thornby (Thornby 
) , in the world, is a rare surname. The cognomen Thornby is characteristic of the United Kingdom, where it is a rare surname, Australia, and New Zealand, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in the United Kingdom, the United States, and Australia. Much less frequently, Thornby is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Thornby | Australia, Spain, New Zealand, United Kingdom, United States |
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robert thornby American film director and actor (1888-1953), US (b. 1888) |
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| william j. thornby American politician, US (b. 1856) |
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| krisy-ann thornby researcher |
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| david thornby Ph.D. University of Queensland 2004 |
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| david f thornby researcher |
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| john ingram thornby Ph.D. University of Minnesota-Minneapolis 1964 |
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Mr, Noah, Marie, Marye, Sally, Sarah, Susan, Scott, Allan, Chris, Cathy, Colin, Craig, Cindy, Barry, Karen, Kerry, Keith, Kevin, Krisy, Robin, Roger, Judy, Debra, Jeff, Dale, Ms, Sue, Ann, Ben, Ken, Kim, Pat, Jan, Jim, Tim, Ian, Mary, Mark, Myra, Alan, Anna, Adam, Cole, Kirk, Rose, Dana, John, and David