Giannis
In short
Giannis is a common Greek male given name that serves as a variant of the name John.
In plain words
It is a popular name in Greece and Cyprus. While people use Giannis or Yannis in daily life, the formal version used on official documents is Ioannis.
A simple example
A man might introduce himself as Giannis to his friends, but his birth certificate will list his name as Ioannis.
Why it matters
Understanding the different spellings helps when researching Greek family trees or official records. It also explains why a person's casual name might look different from their legal paperwork.
Easy to mix up
It is often confused with the formal version, Ioannis, or other regional variants like Yannakis.