When talking about the Arch in Regensburg, locals immediately know which building is being referred to. Many structures in the old town are known by their house names, some of which have been preserved for centuries. Typically, these were named after their former owners, like the “Zant” and “Ingolstetterhaus”, or after their use, such as taverns or restaurants located within them. Examples of this include ‘der blaue Hecht’ (the blue pike) and the “Goldene Krone” (golden crown).
However, this is not the case with the Arch - how the house got its name remains unclear. One theory is its similarity to Noah's Ark from the Old Testament. When viewed from the west, the building looks like the bow of a large ship. Yet, a more likely derivation is found in Johann Andreas Schmeller's Bavarian Dictionary from 1872; under the entry "Arch", it explains a "shore fortification against the tearing of a river." While the Arch is quite far from the nearest river, the Danube, the Vitusbach once flowed through Rote-Hahnen-Gasse from the south. Its original path remains evident in the curve of the alley and the construction line of the houses leading up to Haidplatz.
We also have records of the old profession of the archer (but not with bow and arrow) who was responsible for maintaining the riverbanks, ensuring they remained free of rubbish. This was essential during the middle ages since streams within the city were often used for waste disposal.