-itz and -ow are mostly exclusive to the east cuz its used mostly by Slavic Settlements. Just if someone else wondered
What about -furt? I reckon there’s a handful.
The -ach and -bach are interesting. Are there no rivers in the north?
It might be -beek and -bek, due to Lower Saxon (Plattdeutsch) influence. -bruch/-bruck and -brück might also be relevant.
Not might, it is this. -bruch, -bruck and -brück are something different though. While being related to the english “brook”, a Bruch is swampland. -bruck or -brück however indicate a bridge (like the German word for bridge, Brücke).
Ach.