Surname Kilday (Kilday 
) , globally, is quite a rare family name. The cognomen Kilday is habitual in New Zealand, where it is a rare surname, the United Kingdom, and Australia. Not in comparison with a country's population, the name is most common in the United States, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Kilday | United Kingdom, South Africa, Australia, United States, New Zealand |
|
paul joseph kilday American politician (1900-1968), US (b. 1900) |
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| lowell c. kilday American diplomat, US (b. 1931) |
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| john-paul kilday researcher (ORCID 0000-0002-0539-215X) |
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| beth ann kilday Ed.D. Montana State University 1996 |
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| andrea kilday New Zealand taekwondo practitioner, NZ (b. 1982) |
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| gemma kilday |
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