Here's why:
* Plambeck is a place name in the Netherlands, specifically in the province of Groningen.
* Dutch surnames often derive from places of origin.
* German surnames tend to have different structures and endings than "Plambeck."
However, it's possible for someone with Dutch ancestry to have the surname "Plambeck" even if they live in Germany. It's also possible for the surname to have evolved from a different language or origin altogether, though it's less likely in this case.
To determine the origin of a specific surname, you'd need more information about the individual's family history.