I think its best if we have a review of all the available info on this William Jones as it may or may not be a case of "all that glitters"!
Now whilst I obviously am not aware of the places concerned in Ayrshire,given what I know of possible parents,I am looking very strongly at a William Jones given as 9 months old in the 1881 Census and born in Riccarton Ayrshire the son of a William and Margaret Jones.Its worth pointing out for later that following the William and Margaret Jones family's entries this William appears still to be at home in the 1901 Census.
As earlier the William Jones married a Mary Ann Edwards at Rhosymedre Denbighshire in 1907.I have from my contact found out that this Mary Ann Edwards was the daughter of a Thomas Edwards and an Ellen Matthews who it appears married at Wrexham Denbighshire in 1877.Now the 1901 Census for this Thomas and Ellen Edwards in Chirk Denbighshire-RG13/2546/183/30,shows Mary A given as born in c 1881 amd perhaps an interesting William Jones in their household given as born in Malpas in c 1880.
Now it appears that Rosie pointed me in the direction of the correct 1911 entry for it appears my contact's ancestor is a Jessie Jones born in Cefn Mawr Denbighshire in 1910.
It has to be said though that the William Jones married to Mary in 1911 is given as born in Malpas again!Though my contact was not aware of the sister to the William Jones in Ayrshire in 1881 given as born in c 1869 Jessie,when I put it to her as an explanation for the name?
Regards
William Russell Jones.