female — oakley, oceona, octavia, ode, odessa, odette, oma, olinda, olive, olivia, olympia, opal, ophelia, oprah, ora
male — odin, odysseus, olaf, oliver, omar, orion, orlando, orpheus, orville, oscar, oswald, otis, otto, owen, oz
surnames — oakley, obama, o'brian, o'conner, odell, ogawa, ojeda, o'keefe, oliver, olsen
