The Trouble Names
Read what JKR says:
Then why – WHY – (I hear you cry) – did I give him the surname “Evans”? Well, believe me, you can't regret it more than I do right now. “Evans” is a common name; I didn't give it much thought; I wasn't even trying to set up another red herring. I could just as easily have called him 'Smith' or 'Jones' (or 'Black' or 'Thomas' or 'Brown', all of which would have got me into trouble too).
Now, I only know that "Black" could have caused problem for her but what the other names are about? 😕
Smith, Jones, Thomas, Brown.