Quote Originally Posted by Alma View Post
even you really tried hard, I cannot see any connection in most of your examples...
and I don't know why you have doubts in "supposed source" most of them are too obvious...
You should have doubts. Like many parts of "the free encyclopedia that anyone can edit", that Wikipedia chart is at least partly hocus-pocus. If you take the example of the katakana ƒ“ (n), the origin is disputed. Yet the Wikipedia graph shows it coming from a part of a kanji. I think somebody decided everything was "too obvious" and just created that chart, without checking.
Notice they can't even get the katakana ƒEƒB for Wikipedia right in their illustration at the top of every page. It still says ƒNƒC.