Thanks for the replies!
RobertCasey: Unfortunately, there is no surname. As I say, my area of Wales still used the 'no surname' system (patronymics) in the early/mid 1800s - which rules out One Name /Surname sites. The name was Evans after 1820s - but before then it wasn't - due to the patronyms; i.e.where the children were not given their father's last names.
DevonCruwys: I didn't know about the Welsh DNA projects, so thanks. I've followed the 1st link - seems the number of participants was last listed in 2013 & there's not been an update since them, so I wonder if the group is still running? Also as it has 572 participants, this seems - and excuse my inexperience - a low number. If so, I suspect that finding a DNA match (to help with my brick wall) with other participants doesn't seem likely. I was wondering if the Ancestry DNA test would be more likely to match my results with other participants?
Thanks again, both.