Siedenburg rhymes with:
fredenburg, friedenberg, vredenburg, brandenberg, brandenburg, fredenburg, freudenberg, friedenberg, goldenberg, ladenburg, lindenberg, oldenburg, rodenberg, rodenburg, seidenberg, vandenberg, vandenbergh, vandenberghe, vandenburg, vandenburgh, vradenburg, vredenburg
Siedenburg sounds like:
schwichtenberg, seidenberg, stainbrook, stamberg, stanbrough, steinberg, steinberg's, stemberg, stenberg, stoneberg, stoutenburg