Cognomen Glenday (Glenday 
) , all around the world, is a rare surname. The surname Glenday is characteristic of New Zealand, where it is a rare surname, Australia, and Canada. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Australia. Much less frequently, Glenday is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Glenday | Australia, Canada, United Kingdom, South Africa, United States |
| ann glenday (b. 1809) |
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| vincent goncalves glenday British colonial administrator (b. 1891) |
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john glenday poet, GB (b. 1952) |
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| alice glenday New Zealand writer, CA (b. 1920) |
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craig glenday Editor in Chief for Guinness World Records, GB (b. 1973) |
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| julia glenday researcher |
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| j d glenday researcher |
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| peter glenday 19th century Scottish-born American, US |
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| james glenday |
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