In all the world, Öster (Öster 
) is an extremely rare unknown gender first name. Predominantly, Öster is the last name as well as the forename.
Bo, Emma, Ebbe, Hans, Frej, Olof, Olli, Åsa, Maria, Marki, Malin, Minna, Sanna, Simon, Sirpa, Alice, Albin, Karin, Katja, Peter, Robin, Roger, Erik, Eric, Elin, Nina, Mia, Jan, Tom, Ulf, Mats, Sara, Anna, Anne, Carl, Karl, David, Kurt, Gert, Lars, Leif, Lena, Lina, Linn, Lova, John, Taru, Tomi, Rolf, and Linda