Boat’s name:

If a boat is registered, you cannot lawfully change her name, without the permission of the Customs. All registered vessels must have their name and port painted on them. The name of a boat is not necessarily sold with the craft, but the former owner cannot prevent you from using the old name if you wish to, unless you have made an agreement before buying not to do so; nor can he prevent you from changing the name.

MAKING SAIL.