Cognomen Glennon (Glennon 
) , globally, is quite a common family name. The surname Glennon is habitual in Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom. Not in comparison with a country's population, this name is the most popular in the United States, Ireland, and the United Kingdom. Very seldom, Glennon is the forename as well as the last name.
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| Glennon | Argentina, Ireland, United Kingdom, United States, Australia |
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james henry glennon American naval rear admiral and Navy Cross recipient, US (b. 1857) |
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john j. glennon Catholic cardinal, IE (b. 1862) |
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bert glennon American film director (1893-1967), US (b. 1893) |
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| edward j. glennon American judge, US (b. 1884) |
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| teddy glennon English cricketer (1889-1926), GB (b. 1889) |
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| tom glennon GB (b. 1900) |
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| margaret wyatte glennon U.S. military veteran, US (b. 1919) |
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| maurade glennon Irish writer, IE (b. 1926) |
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| pat glennon Australian jockey, AU (b. 1927) |
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| glennon engleman American hitman, US (b. 1928) |
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matt glennon British footballer (born 1978), GB (b. 1978) |
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james b. glennon United States military officer, US |
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| john glennon American stage actor, screenwriter and playwright (b. 1931) |
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sean glennon American football player (born 1985), US (b. 1985) |
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mike glennon American football player (born 1989), US (b. 1989) |
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