Technically, yes, but not right away. It is not possible to switch back to an old name after undergoing a name change. The name pool will be available again 60 days after the last name change or six months after the last name change. After six months, if the name is still free and you haven't changed your name for 60 days, you can take back your old name. It's always a good idea to think twice before undergoing this inconvenient process.