Surname Kilsby (Kilsby 
) , throughout the world, is a rare family name. The cognomen Kilsby is characteristic of Australia, where it is a rare surname, New Zealand, and the United Kingdom. Measured by absolute frequency, this name is the most popular in the United Kingdom, Australia, and the United States. Much less frequently, Kilsby is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kilsby | United Kingdom, Canada, Australia, New Zealand, United States |
|
arne kilsby Swedish artist, SE (b. 1895) |
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| susan kilsby American investment banker and businesswoman (b. 1950) |
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| paul kilsby GB (b. 1953) |
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| william kilsby Kilsby, William (d. 1346), administrator |
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| chris g kilsby researcher, ORCID id # 0000-0003-3422-294X |
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| matt kilsby |
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| laurence kilsby British tenor, GB (b. 1998) |
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