Family name Kilcullen (Kilcullen 
) , around the world, is quite a rare last name. The cognomen Kilcullen is habitual in Bermuda, where it is quite a rare surname, Ireland, and Australia, where it is a rare surname. Not in comparison with a country's population, the name is most common in the United States, Ireland, and the United Kingdom.
| VARIANT | COUNTRY |
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| Kilcullen | Australia, Canada, Ireland, United Kingdom, United States |
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david kilcullen Australian author, strategist and counterinsurgency expert, AU (b. 1967) |
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| bob kilcullen American football player (1936-2019), US (b. 1936) |
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| john kilcullen Australian political philosopher and historian, university professor (1938-), AU (b. 1938) |
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| matt kilcullen American basketball player-coach, US (b. 1954) |
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| niamh kilcullen researcher |
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| dan kilcullen college basketball player (1972–1974) Boston College |
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| meegan kilcullen researcher |
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| barney kilcullen college basketball player (1953–1954) Bradley |
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| ryan kilcullen college basketball player (2012–2012) Boston College |
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