Janos, Janse, Janus, Jonas, Jones, Owens
Iefan, Ieuan, Ifan, Siôn, Jon, Juan, Janez, Jovan, Ian, Iain, Ioann, Ioan, Iancu, Ionel, João, Iwan, Ean, Jonas, Janis, Eoin, Sean, János, Keoni, Ioannis, Yannis, Xoán, Jani, Juhana, Juha, Jouni, Juhani, Joni, Jussi, Juho, Hannu, Jukka, Jochjo, Johano