Change the name, WD46 and the whole kit and caboodle would have to be relaunched so that the new name became universally known. When organisations go in for a name change it is often followed by a total collapse which takes a long time to recuperate from. It is not just the members who know it as Gransnet, it is also all the advertisers, suppliers, newspapers and magazines, tax collectors, cake suppliers, everyone.
Gran is a the first syllable of Grandfather as well as Grandmother. If that is your only reason for not joining, then you are missing a valuable resouirce, and a lot of fun.