Around the globe, Oelker (Oelker 
) is an extremely rare unknown gender first name. Much more frequently, Oelker is the last name as well as the forename.
Mr, Ralf, Rolf, Rita, Ruth, Ryan, Dana, Dave, Dale, Dawn, Kyle, Dirk, Gina, Lars, Leah, Linn, Jack, Jase, Jake, John, Jens, Duke, Karl, Kara, Burt, Ms, Ann, Ada, Rob, Dan, Jan, Joe, Jim, Tim, Uwe, Mary, Mark, Matt, Sven, Alex, Andy, Abby, Chas, Carl, Cody, Beth, Jean, and Jeff