In all the world, Østlie (Østlie 
) is an extremely rare unknown gender first name. Much more prevalently, Østlie is the last name as well as the forename.
Jan, Maiken, Morten, Sidsel, Sverre, André, Bjørn, Kjetil, Grethe, Wenche, Martin, Martine, Sabrina, Kristin, Henning, Fritjof, Ingwild, Kristian, Jan-Erik, Charlotte, Krisander, Mathias, Marius, Ingar, Vidar, Sven, Anne, Arne, Pål, Rune, Geir, Lars, Lise, Tore, Tomm, Nina, Finn, Unni, Kevin, Kåre, Roger, Ellen, Einar, Helge, Heidi, Hilde, Kristoffer, and Bjørn-Olav