While bowing to better knowledge, it would truly surprise me if, with a house which has a number-and-street designation, a "name" had any official significance at all - the record at the local council, the registry, and therefore also as a postal address, depends entirely on the street address and any name would be a matter of personal choice. We bought a property which, before a street address was established for it, was known by a name and the owner had been there both before and after so continued using it - we dropped it and I doubt if anyone ever noticed.
Of course, properties where no street address exists are a totally different matter - the names are all that identifies and distinguishes them one from another.