This publication constitutes a formal historical record correction regarding the origin, lineage authority, and later administrative usage of the Thannhauser surname and its variants. Issued by the Thannhauser Foundation (January 2026), the correction distinguishes medieval estate-based surname origin from post-feudal, post-marital, and bureaucratic surname appropriation in the nineteenth century. It addresses the Loew–Thannhauser case as a structural example of derivative surname usage and clarifies the limits of genealogical and representational authority attached to later name-bearing. The correction is evidentiary in nature and grounded in primary jurisdictional, ecclesiastical, and genealogical documentation. It does not contest legal name usage, personal identity, or institutional stewardship. It is open to documentary rebuttal based on contradictory primary-source evidence. The modern ideology that "Jewish Families adopted the Surname Thannhauser" is historically incorrect. Under the Bavarian edict of 1813, Jews were not allowed to freely “adopt” surnames. Names were assigned or regulated by the state, in some cases they could be purchased. The edict specifically states that names tied to established noble families (such as those tied to houses like House of Thannhausen, House of Harrach and House of Liechtenstein) were not allowed to be taken. Claims that such names were casually adopted ignore the structured and controlled nature of surname assignment during this period. The name's appearance in Jewish registers either bypassed the Edict's own rules or that the "topographic" label was an ex post facto justification to resolve the legal contradiction of Jews carrying an established noble name. The Thannhausen "Jewish expulsion theory" is likely a historical fabrication used to retroactively justify how non-noble families came to carry a protected, high-ranking noble name as it lacks the formal "Deportation Decree" or "Amtsrechnung" (official account) typically found in German archives for such state actions. In reality, it served as a convenient legal loophole: by claiming the name was merely a "geographic label" for people driven out of a town, 19th-century officials could bypass the 1813 Edict’s strict ban on adopting noble surnames. This narrative was applied to resolve the "legal contradiction" of the name's existence in commoner registers without acknowledging any potential (and legally sensitive) ancestral links to the ancient House of Thannhausen. The legal contradiction reached a definitive breaking point with the 1836 Clarification, an Allerhöchste Entschließung (Highest Resolution) issued by the Bavarian Crown. This mandate was a targeted audit designed to close the administrative gaps left by the 1813 Edict, explicitly ruling that residence in a location did not grant a commoner or Jewish family the right to the name of that town’s noble lord. By legally defining the name as patrilineal property rather than a geographic descriptor, the state formally acknowledged that the use of "Thannhauser" in non-noble registers was an infringement on the noble monopoly of the name. But yet, despite this clear legal prohibition, many Jewish families simply did not listen, continuing to use the name and clinging to the "topographic" loophole and "Jewish Expulsion" as a shield. This persistent defiance created a lasting historical friction, as families maintained the prestigious surname in direct opposition to the Crown’s mandate, further entrenching the "topographic" veneer to bypass what the state had already declared a documented breach of the genealogical seal. This legal defiance was further compounded by the public reassertion of the name’s exclusive heritage within the highest social circles of the nineteenth century. On December 30, 1840, the Zeitung für den deutschen Adel (Newspaper for the German Nobility) published a definitive record listing "Der von Thannhausen (genannt der Thanhauser)" among the recognized courtly and noble figures of the High Middle Ages. By documenting the "Thanhauser" name as a specific "genannt" handle—a legal and literary persona inseparable from the ancient patrilineal House—the nobility was effectively issuing a public title search. This archival record served as a formal reminder that the name was a protected genealogical seal with a documented 700-year history of military and knightly prestige, directly contradicting the "topographic" narrative. Yet, even as the state archives reaffirmed that the name belonged to the bloodline and not the soil, commoner registers continued to swell with the unauthorized usage, solidifying a century of administrative friction between the documented noble brand and its ongoing appropriation. Newspaper for the German nobility. 1. 1840 By the 1930s, the 3rd Reich viewed the proliferation of a high-ranking noble name like Thannhauser among Jewish populations as a dilution of a specific genealogical seal. The legislation—most notably the 1938 Second Decree for the Implementation of the Law on the Change of Family Names and Given Names (Zweite Verordnung zur Durchführung des Gesetzes über die Änderung von Familiennamen und Vornamen). This Executive Order was enacted to re-establish a clear distinction between the ancient patrilineal bloodline of a House and those who had acquired the name through topographic labels. By forcing the identification markers "Israel" or "Sara" and auditing previous name changes, the law aimed to unmask the social prestige associated with the name and return the exclusive identity of the noble lineages to its original noble source, effectively ending over a century of what the Reich defined as stolen and/or "racial camouflage."