The end of this surname has me scratching my head.

Petter Simessz? Simessen? Something else?

I read it as Petter Simessz

2nd that

I think Simessz is what I'm going to go with, for lack of a better option, but I have a sneaking suspicion that that's not actually a "z", given these cases of what appears to be "Malz" and "Frantz" on another page, in the same handwriting style.