No, I'm sure you have to notify people. What if you needed the emergency services and they couldn't find your house because you'd changed the name and it wasn't on their map/records and what about the post office, how would they deliver your post? I'd ask at the post office, I'm sure they'll be able to help you.
Iwould advise you to contact your local council as they need to check for same name in the road I think it is probably the planning dept who deal with this.