In certain geographical areas it is a popular and also a traditional name.
Sean
John, Paul, Joe, Sean?
Sean Biggerstaff's birth name is Sean Biggerstaff.
Sean Kanan's birth name is Perelman, Sean.
Sean Banan's birth name is Sean Samadi.
"Giovanni" is an Italian equivalent of "Sean."Specifically, the Italian and the Gaelic words are popular proper nouns. They both translate into English as "John." The pronunciation of the Italian first name is "djyoh-VAHN-nee."
According to the IMDB and Wikipedia, Sean Penn's real name is Sean Justin Penn.
Sean Combs' birth name is Sean John Combs.
Sean Rio Amir is Sean Flynn's full name
Sean Runnette's birth name is Sean Munkittrick Runnette.
Sean Salisbury's birth name is Richard Sean Salisbury.
Sean Salmon's birth name is Sean Michael Salmon.