Gosh, I have so many myths in various lines.
One that I laugh at is that the one line of family believed that one of their ancestors, Riverina Simpson, was the first female born in the Riverina, (New South Wales, Australia), obviously thought this because of the name given to her, yet they never checked and noticed that she had two sisters born there before her.

Another was that a Brower Wild (gr grandfathers brother) owned hotels in London.
Close, but no cigar. It was a John Brear Wild and yes, he owned hotels in London.
On my husband side there are the Thomsons, the family all new that they were from Germany and had presumed, and many swear to it, that he must have been a german sailor and jumped ship and changed his name. This was decided as they did not see Thomson as a German name. I found the name Thomson in Germany
also on my hubby's side they have the name Burn, " we are related to Robbie Burns the poet" they all say.
Not so!!!
I never disregard the myths, but never take them as gospel either.
Margaret