There's an old family bible currently listed on ebay, Item no 140443947838.
The seller has given me the following info when I emailed.
"I don't speak Welsh but the first page "Rhestr Deuluaidd" - "Enwau Y Rhieni"
Y Gwr: William Williams
Ganwyd: Yachnuedd 2nd 1864
Y Wraig: Hannah Jones
Ganwyd: Awst 26 1865
Priodwyd: (Cant really read the joined up writing too well but looks to me as though it says...)Yn Penybont ar Ogwr, Sir Forgannwg Yru, Mehefryn 27 1889
There are other pages, I'm guessing the next is either Family-Tree or Children?
"Enwau Y Plant"
Edward Williams - 1891
Elizabeth Williams - 1892
Sarah Blodwyn - 1894
Ivy May L Williams - 1896
William Ezekiel Williams - 1899
Daniel David Williams - 1901
Ivy Mary Williams - 1905
Cecil

?? - 1906
There are some other pages but obviously generally Williams'
FYI, I had found this Bible in the attic of an old pub which used to be The Old Kings Head in Ogmore Vale, Bridgend, South Wales."
A quick look through the census for this family shows they are from the Llandyfodwg area. It would be nice to think that the bible could be returned to a family member. Maybe they belong to a Rootschatter out there somewhere?
Best wishes
Ruth