Family name Cahillane (Cahillane 
) , worldwide, is a rare surname. The family name Cahillane is characteristic of Ireland, where it is quite a rare surname, the United Kingdom, where it is a very rare surname, and Australia. Measured by absolute frequency, it is the most numerous in the United States, Ireland, and the United Kingdom.
| VARIANT | COUNTRY |
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| Cahillane | United Kingdom, Australia, Ireland, United States, France |
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sean francis cahillane politician in Massachusetts, US, US (b. 1951) |
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| james cahillane (b. 1910) |
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| steven a. cahillane American business executive |
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| marie cahillane researcher |
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| mary cahillane Northern Irish election candidate |
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| paul cahillane Irish Gaelic footballer, IE (b. 1989) |
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Mr, Liam, Lori, Lynn, Jack, John, Tony, Nora, Noah, Neil, Lisa, Eric, Emma, Will, Maria, Megan, Miley, Micky, Sandy, Sarah, Susan, Erin, Steve, Greg, Rita, Ann, Amy, Kif, Dan, Lee, Jim, Tom, Tim, Mari, Ryan, Mary, Matt, Sara, Sean, Alex, Anne, Brad, Paul, Rory, Rich, Mark, and Aoife