Iohannes

Pronunciation	German: [joˈhanəs] Dutch: [joːˈɦɑnəs] Amharic: [johänɨs]
Gender	Male
Word/name	Latin, German, Hebrew, Norwegian, or Dutch Name
Related names	John, Jan, Yann, Ian, Evan, Juan, Johan Jean, Giovanni, Hovannes, Seán

Johannes is a Medieval Latin form of the personal name that usually appears as "John" in English language contexts. It is a variant of the Greek name (Ιωάννης) and Classical Latin (Ioannes), itself derived from the Hebrew name Yehochanan, meaning "Yahweh is gracious". The name became popular in Northern Europe, especially in Germany. Common German variants for Johannes are Johann, Hans (diminutized to Hänschen or Hänsel, known from "Hansel and Gretel", a fairy tale by the Grimm brothers), Hannes, Jens (from Danish) and Jan (from Dutch). In the Netherlands, Johannes was without interruption the most common masculine birth name until 1989. Jan is a variant of John known in Catalan, Czech, Slovenian, Dutch, Scandinavian, Cornish, German, Afrikaans and Northern Germanic. Polish has its own variant Janusz as has Slovenian "Janez". Common English variants for Johannes are John or Johnny. There are also variants of the name in other languages:

...
Wikipedia