This is the 8203rd most frequent German word.
ioannis
"Ioannis" is not a German word but a Greek given name equivalent to "John" in English.
In this sentence, 'Ioannis' is used as a proper noun, specifically a given name, referring to a person who is described as a talented musician.
Ioannis ist ein talentierter Musiker.
Ioannis is a talented musician.
In this context, 'Ioannis' identifies the person whose works are widely recognized, reinforcing the function of the word as a name.
Die Werke von Ioannis sind weltweit bekannt.
The works of Ioannis are known worldwide.
Here, 'Ioannis' again serves as a proper noun representing the name of the individual the speaker encountered.