By the way, according to Wikipedia;
There are numerous forms of the name John in different languages; these were formerly often simply translated as "John" in English, but are increasingly left in their native forms eg
"Jan is a form of John that is used in various languages. The name is used in Afrikaans, Belarusian, Circassian, Catalan, Cornish, Croatian, Czech, Devon dialect, Dutch, German, Kazakh, Polish, Slovak, Slovenian, Scandinavian and Finnic languages."
"Ian or Iain is a name of Scottish Gaelic origin, which is derived from the Hebrew given name יוֹחָנָן (Yohanan, Yôḥānān) and corresponds to the English name John."