Quote Originally Posted by gilmore View Post
"There is no official list of recognised septs. This is a matter for each chief to determine. But where a particular sept has traditionally been associated with a particular clan it would not be appropriate for that name to be treated by another clan chief as one of its septs."

The Court of the Lord Lyon, http://www.lyon-court.com/lordlyon/240.html

and that is that.
Doesn't actually seem to stop them, though, does it?