Family name Mackessy (Mackessy 
) , across the world, is a rare surname. The cognomen Mackessy is characteristic of Ireland, where it is quite a rare surname, the United Kingdom, where it is a very rare surname, and New Zealand. 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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| Mackessy | United Kingdom, Ireland, Australia, New Zealand, United States |
| billy mackessy Irish Gaelic footballer and hurler, IE (b. 1880) |
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| stephen p mackessy researcher |
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| fionán mackessy Irish hurler (b. 1998) |
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Mr, Lesa, Lisa, Liam, Lori, Luke, Jack, Jake, Jade, John, Jean, Noel, Emma, Eoin, Maria, Marie, Molly, Megan, Mikey, Sarah, Shane, Shaun, Gwen, Dawn, Dani, Rita, Ms, Ki, Ed, Ben, Bob, Pat, Don, Lee, Joe, Joy, Susan, Jim, Tim, Ian, Mary, Mike, Sean, Anne, Adam, Bart, Paul, Rick, Tom, and Steve