In the entire world, Rönkkö (Rönkkö 
) is an extremely rare unknown gender first name. Much more frequently, Rönkkö is the last name as well as the forename.
Anu, Kari, Kati, Kiia, Pasi, Pyry, Jani, Jami, Jari, Jaan, Joni, Joel, Jere, Juha, Juho, Taru, Tatu, Tomi, Toni, Topi, Tero, Timo, Ahti, Aksu, Arja, Anni, Ari, Aki, Kim, Noa, Nea, Esa, Eva, Ira, Ida, Mari, Niko, Manu, Miko, Sara, Sari, Sami, Samu, Satu, Simo, Suvi, Anna, Anne, Mika, and Nina