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In the entire world, Grehan (Grehan ) is a very rare epicene forename. Much more frequently, Grehan is the last name as well as the forename.
Gréhan, Греган, and Грехан
Mr, Ian, Mary, Mark, Matt, Mags, Mila, Mike, Shay, Shea, Sean, Alan, Andy, Anna, Anne, Adam, Carl, Colm, Tom, Clem, Jim, Jan, Ms, Al, Wm, May, Sue, Ali, Ann, Amy, Ben, Kim, Pat, P-E, Rob, Rex, Dan, Ger, Lee, Joe, and Cllr