Last name Kilgannon (Kilgannon 
) , all over the world, is a rare cognomen. The cognomen Kilgannon is characteristic of Ireland, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand. Measured by absolute frequency, it is the most numerous in the United Kingdom, Ireland, and the United States.
| VARIANT | COUNTRY |
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| Kilgannon | Australia, Canada, Ireland, United Kingdom, United States |
| thomas kilgannon Titanic victim (b. 1890) |
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| jim kilgannon British association football player (1937-2000), GB (b. 1937) |
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| eily kilgannon actress |
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| sean kilgannon Scottish footballer (born 1981), GB (b. 1981) |
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| ian kilgannon |
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