In all the world, Siskos (Siskos 
) is an extremely rare unknown gender first name. Much more frequently, Siskos is the last name as well as the forename.
Mr, Ioan, Zoë, Maria, Maree, Makis, Minas, Sarah, Sakis, Shana, Vici, Sofia, Aliki, Anast, Apolo, Peter, David, Garry, Georg, Linda, Jacob, Alexa, Erin, Niko, Nick, Ms, Ann, Ari, Liz, Tom, Evi, Zoe, Mary, Skye, Alex, Alan, Ande, Aris, Paul, Dina, Greg, John, Jogo, Theo, Teri, Naum, James, and Jimmy