Help with Farm Name Done

[Bidr]

Thank you all !

[hanes teulu]

Side by Side maps - position cursor over Pyllau-Crynion for location on modern map and to scroll -
https://maps.nls.uk/geo/explore/side-by-side/#zoom=17.0&lat=52.08282&lon=-4.05930&layers=6&right=ESRIWorld

In 1841 William is at Glanrafon and the premises listed either side are " ... Cwmbedw, Glanrafon, Gwar gate, Glanhathren ...". Those listed either side can be viewed on this map but not Glanrafon (the map is 1887 - the earliest I can find) -
https://maps.nls.uk/view/102178601#zoom=6&lat=5719&lon=5150&layers=BT 

[hanes teulu]

Tithe maps (about 1840s) show holdings for William Williams, Glanyrafon, Pencarreg. Click on view map or apportionment or Tithe map overlay.
https://places.library.wales/search/52.085/-4.053/16?alt=&page=1&refine=&query=glanyrafon&order=desc&sort=score&rows=100&county%5B%5D=Carmarthen&parish_facet%5B%5D=Pencarreg&occupier_facet%5B%5D=William%20Williams&leaflet-base-layers_94=on

I also checked Pwyllau Cryn(i)on tithes and noted the landholder was the Rev. Evan Evans - William's landlord at Glanyrafon.

[Sam Swift]

Not sure what time scale you're after but the occupier of the farm in 1828 was a Samuels and he's is listed in a NLW document https://archives.library.wales/index.php/informationobject/browse?topLod=0&sort=relevance&query=Pyllecrynon&repos=

[Bidr]

Thank you all!

[RIZZLES]

In 1841, Pyllau Crynion was owned by the Rev. Evan Evans and leased to a David Samuel. David Samuel died early in 1845, so the farm may have been available for lease then.
William Williams passed away in July 1869. He is buried at St Peters Church, Lampeter His (second)wife Hannah passed away in January of 1894 age 82. She was buried at St Peters Church, Lampeter on 29th January.
Their daughter Eleanor Williams was still at Pyllau Crynion on the 5th May 1902 when her granddaughter was born. However by 1911 she had moved to Cefnbryn Lodge, Pencarreg, SA48 8DX.
I am curious about the Thomas Williams you mentioned, it could be Williams' eldest son. He was born in 1843. As far as I am aware, William left no will. I would love any details you have about this Thomas as I am new to this site and cannot pick it up through the thread.