In the entire world, Oestman (Oestman 
) is an extremely rare unknown gender forename. Much more frequently, Oestman is the last name as well as the forename.
Mr, Karen, Kevin, Randy, Ralph, Robin, Renee, Deena, David, Donna, Duane, Laura, Larry, Linda, Logan, James, Jared, Joyce, Jerry, Terry, Tessa, Tyler, Brett, Brent, Chris, April, Ms, Ann, Joe, Ida, Mary, Mark, Adam, Cari, Kaci, Kyle, Elmer, Dean, Lisa, Lori, Luke, John, Judy, Eric, Fred, Maria, Missy, Steve, Gene, and Erica