Orsini-Rosenberg
An Austrian princely family, the Rosenberg changed its name to Ursini-Rosenberg (and subsequently to Orsini-Rosenberg) in 1683, while creating spurious claims of kinship to the Orsini, which were regarded at the time as more prestigious. No convincing evidence of the link was ever brought, and as such many researchers consider it fictional.
Read more about this topic: Orsini Family