Ioan ystyron enw gorau: Lwcus, Gyfeillgar, Hael, Anweddol, Siriol. Cael Ioan ystyr enw.
Ioan tarddiad enw cyntaf. Romanian and Welsh form of John. This is also a variant transcription of the Bulgarian name Yoan. Cael Ioan tarddiad enw cyntaf.
Ioan diminutives enw: Iancu, Ionel, Ionuț, Ivo, Nelu, Yanko. Cael Llysenwau ar gyfer Ioan.
Enwau cyfystyr ar gyfer Ioan mewn gwahanol wledydd ac ieithoedd: Anže, Deshaun, Deshawn, Ean, Eoin, Evan, Ganix, Ghjuvan, Gian, Gianni, Giannino, Giannis, Giovanni, Gjon, Hampus, Hank, Hanke, Hankin, Hann, Hanne, Hannes, Hannu, Hans, Hasse, Honza, Hovhannes, Hovik, Hovo, Iain, Ian, Ioane, Ioann, Ioannes, Ioannis, Iohannes, Ion, Iván, Ivan, Ivane, Ivano, Ivica, Ivo, Iwan, Jaan, Jānis, Jack, Jackin, Jake, Ján, Jancsi, Janek, Janez, Jani, Janika, Jankin, Janko, Janne, Jannick, Jannik, Jan, Jan, János, Janusz, Jean, Jeannot, Jehan, Jehohanan, Jens, Jo, João, Joannes, Joan, Joãozinho, Joĉjo, Johan, Johanan, Johann, Johannes, Johano, John, Johnie, Johnnie, Johnny, Jón, Jonas, Jone, Joni, Jon, Jon, Jóannes, Jóhann, Jóhannes, Joop, Jouni, Jovan, Jowan, Juan, Juanito, Juha, Juhán, Juhan, Juhana, Juhani, Juho, Jukka, Jussi, Keoni, Keshaun, Keshawn, Nino, Ohannes, Rashaun, Rashawn, Seán, Sean, Shane, Shaun, Shawn, Shayne, Sjang, Sjeng, Van, Vanja, Vanni, Vano, Vanya, Xoán, Xuan, Yahya, Yan, Yanick, Yann, Yanni, Yannic, Yannick, Yannis, Yehochanan, Yianni, Yiannis, Yochanan, Yohanes, Yuhanna, Zuan, Žan. Cael Ioan mewn ieithoedd eraill.
Cyfenwau mwyaf cyffredin gydag enw Ioan: Davenport, Marginean, Ioan, Bota. Cael Rhestr o gyfenwau gydag enw Ioan.
Mae'r rhan fwyaf o'r enwau cyffredin gyda cyfenw Corpus: Asa, Cyril, Cristin, Kristopher, Rudolf, Åsa, Ása. Cael Enwau sy'n mynd gyda Corpus.