Well, all that makes my own name spelling problems smaller than I thought.
It's Jakob, but I often get written down as Jacob, which is at least logical, as opposed to Jakop, which once actually happened. People tend to have more problems with my last name: Katz. In German, "Katze" means cat, so that's a good way of explaining the spelling; yet, here follows a short list of wrong spellings we got:

Kaatz
Kotz ("puke" minus an e)
Herz ("heart")
Tatz ("paw" minus an e)

Fuzz"Jakob W. Katz"pilz