Cognomen Keirnan (Keirnan 
) , worldwide, is a rare family name. The family name Keirnan is habitual in Australia, where it is a rare surname, the United Kingdom, and the United States, where it is a very rare surname. Very seldom, Keirnan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Keirnan | United Kingdom, South Africa, Australia, United States, Canada |
| brian keirnan Peerage person ID=545832 |
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| margaret keirnan Peerage person ID=545833 |
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| jacqueline m keirnan researcher |
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| keirnan l willett researcher |
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Mr, Rose, Debi, Dick, Doug, Gene, Glen, Lisa, Jake, John, Jean, Nick, Noel, Erin, Evan, Susan, Alice, Arlyn, Aspen, Agnes, Ahren, Chris, Paul, Carla, Kane, Anne, Ms, Jo, Max, Ann, Amy, Ben, Kim, Pat, Don, Joe, Joy, Jim, Tom, Ted, Mary, Mark, Mike, Myah, Sara, Alex, Alen, Beth, and Carli