I've noted with interest 2 other threads, 'counting songs', & its derivative, 'shepherd counting systems', & this has prompted me to raise the point that besides pre-English language counting systems surviving, also we can see these remnants in place names all over Britain.

The shepherd counting system is very like welsh, as are lots of names.

Examples; Aberdeen, Penrith, Pen-y-Ghent [a hill in N.Yorks], Chapel-en-le-frith [this a mixture of French & Welsh].

Other examples & histories please