Of course, some names never seem to go out of style and are often handed down in families for generations. Other common ones are given in honor of saints or other important religious people.
In recent years many parents have tried to give their babies unique and uncommon names but it's not unusual for those kids to later discover other children with identical or similar ones in their school or neighborhood. In the meantime, names that were popular in generations past have become unusual now.
Perhaps modern parents who want to give their children uncommon names should consider some of the old ones. Let's see.... How about naming girls Mabel, Bertha, Edith, Ramona, Viola, or Doris? All those names once belonged to people in my own family. And boys might be called Percival, Augustus, Gilbert, Lucidus, or Oliver. There are a few children with some of those names, but they're far less usual than most.