I have a character called Jon, which people sometimes spell as John but I honestly just find that funny because I know Jon would hate that, and making Jon angry is great.
Anna sometimes gets called Anne, but Anna is often a nickname for Anne so that one's pretty understandable.
And I was going to say something about how sometimes people get Seth and Jon's names mixed up, except I do that too sometimes whoops XD I'm a bad mum.
Normally though I'm just happy people remember my characters' names at all, so misspellings don't really bother me!