Gravestone record for David Jones, died 24 June 18not recorded in Parish records

[ianocon]

There is a gravestone in Llanarthne churchyard, Carmarthenshire, for
Daniel Jones son of David Jones of Dan yr Allt, in this Parish who departed this life, July 21 180? aged 8 months. (the last number on the date is indistinct)
also to the memory of Mary of the above named who departed this life January 1826 aged 1? years (again there is an indistinct number on the age)
Also to the memory of David Jones who departed this life June 24 1851 died age 65 years
I've searched Parish records on FindMyPast but can not find these deaths recorded.
Is there an possible reason for this or should I look elsewhere?

[ShaunJ]

There's a burial for Mary Jones aged 18, of Tan yr Allt, on 2 February 1826

https://www.findmypast.co.uk/transcript?id=GBPRS%2FD%2F870150023%2F1

[ColC]

No Daniel or David but Mary below is also on freereg.

Mary JONES   Burial age 18   02 Feb 1826   Carmarthenshire   Llanarthney : St David : Parish Register

Colin

[ianocon]

Thanks CoIC and ShaunJ
Those references seem to pin down Mary
As a result I have been back and trawled parish register via FindMyPast and am wondering if I have found Daniel
There is a Baptism for a Daniel John date 29/4/1800 in Llanartheny with father David.
Could this be the Daniel with the patronymic name John for Jones?  I think i'm right that there was a switch from patronymics in the early 1800s
Only trouble is the gravestone says 21/7/180? aged 8 months.
I'm wondering if its possible the baptism was some months after the birth?
He could have been born right at the beginning of the year which gives near enough 8 months.

Following up on the patronymic idea perhaps the father was known as David John in the records so would have been born around 1785.
Can't see an obvious result at first look on FindMyPast.
I suppose I could also be making an error in assuming David was of Danyrallt and born Llanartheny because the place was only identified on Daniel's name.
Any ideas would be welcome and thanks again
Ian