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I don't see Sidorov on this list...

1 Иванов (Ivanov) 5,043,000
2 Смирнов (Smirnov) 3,419,000
3 Васильев (Vasilev) 2,464,000
4 Петров...

Yes, quite common, only it's written like this: Кузнецов.

I checked, it's the 5th common last name in Russia.

This is the top 5:

1. Ivanov (who would have guessed? :roll: :D )
2. Smirnov...