Family name Colohan (Colohan 
) , all around the world, is a rare cognomen. The surname Colohan is habitual in Ireland, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Ireland, the United States, and the United Kingdom.
| VARIANT | COUNTRY |
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| Colohan | Canada, Italy, Ireland, United Kingdom, United States |
| john fallon colohan Ireland's first motorist (b. 1862) |
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| hugh colohan Irish politician, IE (b. 1894) |
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| christopher brian colohan Ph.D. Carnegie Mellon University 2005 |
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| cloee colohan American association football player, US (b. 1991) |
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Ms, Luke, Jack, John, Joan, Jean, June, Noel, Eric, Erin, Hani, Hugh, Vera, Zach, Maria, Sandy, Sally, Sarah, Shane, Shana, Simon, Susan, Liam, Lisa, Leah, Gail, Sam, Sue, Kim, D P, Ger, Tim, Una, Mary, Mike, Shay, Steve, Sean, Adam, Cory, Colm, Bowe, Bill, Paul, Rory, Dara, Dave, Gary, Alan, and Aaron