I'm seeing that these particular legends/myths/beliefs are very widspread. Comparative anthroplogy suggests that they are staples
No, I can't pick one reference for that because I can't remember what the relevant equivalant to the Stith Thompson Motif Index for fairytales and folklore is.
The point of this is that it's too much like going to a scottish town nad saying " this house is near a bar". It's true, but pretty useless and probably irrelevant. Not saying it's quite that bad in this case but it means that any recourse to it as
evidence needs to be hedged around with caveats.