All around the world, Ryška (Ryška 
) is an extremely rare unknown gender forename. Much more prevalently, Ryška is the last name as well as the forename.
Dan, Daniel, Liška, Jiří, Zdenek, Stáňa, Richard, Dominik, Lukáš, Jiřík, Tomáš, Václav, Ondřej, Miroslav, Ladislav, Jaroslav, Michal, Rostislav, Matouš, Filip, Jan, Alex, Adam, Petr, Vít, Milan, Aleš, Karel, Pavel, Radim, Roman, David, Leoš, Jakub, Honza, Martin, and František