In other words, the registrant of a domain name is the individual whose name and contact information were initially associated with the username and password profile for the domain name. However, this information may not be that of the actual registrant of the domain name. You can simply give your username and password to the new owner, and allow them to change the contact information using the Manage Domain interface. They should also change the domain's profile to a new one with a unique username and password. It is important to remember that anyone with the profile login information can change all info for all domains in the profile, including ownership.
Domain names have a variety of basic rules.
Once you attempt to register a domain name, an error will be given if it is too long.