Cognomen Gilday (Gilday 
) , globally, is quite a rare surname. The cognomen Gilday is characteristic of Isle of Man, where it is quite a rare surname, Canada, where it is a rare surname, and the United Kingdom. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Canada. Very seldom, Gilday is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gilday | Canada, United Kingdom, United States, South Africa, Australia |
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john gilday Australian politician, AU (b. 1874) |
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| john f. gilday American politician, US (b. 1838) |
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| patrick gilday American labor unionist (1862-1917) (b. 1862) |
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michael m. gilday American Navy admiral, US (b. 1962) |
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| edward francis gilday (b. 1910) |
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leela gilday Canadian singer, CA (b. 1974) |
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| david l. gilday (b. 1940) |
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| greg gilday Washington state politician, US (b. 1977) |
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| jay gilday Canadian folk singer-songwriter |
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| steven gilday researcher |
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| katherine gilday Film director |
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| michael gilday Canadian speed skater, CA (b. 1987) |
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| edmund t. gilday |
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| jaclyn gilday Nicaraguan-American soccer player, US |
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