Ancestor’s Father has different last name on marriage record

I’m researching my northern German line around 1812. My ancestors marriage record shows the father has a different last name. My ancestor is Friedrich Havemann, and father listed as Daniel Hamann. At first, I assumed it was a misspelling, until I noticed there are other people with the last name Hamann on other entries.

What was most likely the case here? Step-father, name change, question of parentage? Anyone else see that in your search?