Most popular family names

Family names can be unique or come in large numbers.
In different countries some names are the most popular.
Here is the listing :

• Germany
  • Müller
  • Schwarz
• Great Britain
  • Smith
  • Black
• Poland
  • Kowalski
  • Nowak
• France
  • Noir
  • Blanc
• Italy
  • ???
  • ???
• Russia
  • Tscherkasov
  • Dougorookiy
• Sweden
  • Johanson