I mean a larger percentage of the population bears the most common names. My name was probably around #5 in my birth year, and 3/13 people in my Polish class (including me) are named
Maria. There are also 3 girls named
Julia in the same class. And no, there aren't any nicknames I'm aware of.
masculine list:
https://www.behindthename.com/pnl/191050/124079feminine list:
https://www.behindthename.com/pnl/191050/124080