In many jurisdictions, any "trading as", DBA ("doing business as") or similar "ficitonal" or "pseudonymous" names of a company or other legal entity have to be registered.
The assumption e.g. on Wikipedia would seem to be that the DBA name "differs from the registered, legal name of the business" (seems common sense).
Are there any prominent counter-examples that suggest that this assumption ("DBA / "trading as" names always different than legal names") doesn't hold for 100% of entities in 100% of jurisdictions?
The question is, to put it more simply, "Are there any examples of 'X doing business as X' or any examples of rules that disallow 'X trading as X' explicitly?"
As in the reference and the first paragraph, the question is about duly registered "trading as" names and not any colloquialisms.