Last name Leahan (Leahan 
) , in all the world, is a rare surname. The family name Leahan is habitual in the United States, where it is a very rare surname, Canada, and Australia. Very seldom, Leahan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Leahan | South Africa, Australia, United States, India, Canada |
Ann, Chris, Betsy, Karen, Kacie, Kelly, Kerry, Kevin, Peter, David, Diane, Donna, Larry, Linda, Lorne, Lynda, James, Jason, Jonny, Teren, Holly, Frank, Amber, Meghan, Scott, Susan, Pat, Don, Joe, Tom, Mary, Mark, Sean, Anna, Anne, Cher, Paul, Ruth, Ryan, Dana, John, Jeff, Eliz, Maura, Megan, Sarah, Shaun, Sonja, and Sheila