Updated: Feb 4, 2019
If you have ancestors named Jones, Smith, Griffith or Rees, like me, chances are you've got Welsh blood. According to Wikipedia, the following surnames are the most common surnames in Wales:
You can learn all about the ancient origins of the Welsh people from their Celtic Roots to modern day in documentaries like this one, "Discovering Wales", produced by Reader's Digest, 1992. [Alternate Link]
"We are all part of the story of Wales"