Having my name spelled wrong. Here is a short list of places my name has been misspelled in the past year:
My driver's license
The purchase agreement for my condo
At least half the e-mails either of the attorneys I work for send, even though my name is there, spelled correctly in my e-mail signature every time.
Look, I get it, Eric is the mathematically more common spelling, but Erik is not only very common in its own right, it is also the historically correct spelling. It is a name of Scandinavian origin...it might vary between Erik or Eirik and such, but never Eric.