What is the most common Russian name people mispronounce?

I know the most common name type people mispronounce when it comes to Japanese are: りょ or りゅう (I recall one time when one of the presenters during an E3 like session was discussing street fighter, he messed up bad when pronouncing the protagonists name from the game: リュウ which made me cringe hearing that after knowing how natives actually say that. From the way he said it was like “wry-you” or “ree-yoo” - just plain wrong!)

In hindsight, what is the most common name non Russian speakers often butcher (when it comes to celeb names or famous people) that as an advanced learner or native deem it cringe when knowing how it’s actually pronounced? What phonetics from Russian make it difficult for non natives to pronounce it correctly?