Hey, do what you like Pizza 'Pasta' Hut....just make sure those new range of Pasta dishes live up to all the hype!
Whatever you call yourselves, so long as your customers enjoy your revised menu and experience, become regular patrons of your new-style restaurants, they'll buy into the name, you'll be able to deliver your brand promise and hopefully meet your commercial objectives.
Tick, you've got the marketing budget; now focus on the quality of the food that you plan to dish out and don't hand it to your detractors!