Worldwide, Ylonen (Ylonen 
) is an extremely rare unknown gender first name. Much more prevalently, Ylonen is the last name as well as the forename.
Mr, Marli, Sandy, Sarah, Susan, Brett, Bliss, Kelly, Kevin, Petri, Maria, Peter, Raven, Lauri, James, Jerry, Tiina, Tuija, Hannu, Vicky, Wendy, Pekka, Yair, Oiva, Nick, Ms, Sue, Seb, Anu, Ari, Kai, Kht, Jun, Sara, Anny, Anja, Karl, Paul, Dirk, Ladi, Lisa, Jean, Juha, Todd, Tina, Tilo, Marcus, and Mickey