In all the world, Mullahy (Mullahy 
) is an extremely rare unknown gender first name. Much more frequently, Mullahy is the last name as well as the forename.
Mr, Bill, Kate, Kyle, Paul, Ryan, Lisa, Jack, John, Joan, Brad, Jean, Erin, Fran, Owen, Marie, Molly, Sarah, Shawn, Simon, Susan, Nora, Beth, Cody, Cory, Ms, Ed, Sam, Ann, Kay, Lee, Joe, Jim, Tim, Eva, Ian, Mary, Mark, Matt, Mick, Mike, Sara, Sean, Anne, Aine, Aida, Steve, and Alice