Zülpich

Etymology
From, from (1st century AD). The underlying West Germanic form must be (perhaps by assimilation); compare attested. The cluster -lp- remains unshifted in Ripuarian, and West Germanic -lb- could not have become -lp- there. The b-form might underlie in contemporary 🇨🇬, but older German sources seem to have invariably, so this is probably a later reduction.