Surname Kilroy (Kilroy 
, קילרוי 
) , in the entire world, is quite a rare family name. The cognomen Kilroy is habitual in Ireland, where it is quite a common surname, the United Kingdom, where it is a rare surname, and Australia. Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Ireland. Very seldom, Kilroy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kilroy | Australia, Canada, Ireland, United Kingdom, United States |
| קילרוי | Israel |
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matt kilroy Major League Baseball player, US (b. 1866) |
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mike kilroy American baseball player (1869-1960), US (b. 1869) |
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james j. kilroy American alleged "Kilroy was here" source; politician in Massachusetts, US (b. 1902) |
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bucko kilroy American football player (1921-2007), US (b. 1921) |
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| michael kilroy Irish politician (1884-1962), IE (b. 1884) |
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| james kilroy Irish politician, IE (b. 1890) |
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| elmer kilroy Pennsylvania Speaker of the House, US (b. 1895) |
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mary jo kilroy former United States Congresswoman, US (b. 1949) |
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| alix kilroy British public servant, writer and political activist (b. 1903) |
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joe kilroy Australian rugby league footballer and coach, AU (b. 1960) |
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| jim kilroy American sailboat racer (1922-2016), US (b. 1922) |
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| thomas kilroy Irish writer, IE (b. 1934) |
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| howard kilroy Irish accountant and businessman (1936–2019), IE (b. 1936) |
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| pat kilroy American musician, US (b. 1943) |
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| gerard kilroy GB (b. 1945) |
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