The JONES surname expands to Monmouth and Carnarvon beginning 1538. Sampson Jones is the first to be recorded in the Carnarvon legal records 1538-1544. [1016/49] Now remember, these were English records being established in Welsh counties.
The map above shows the location of Carnarvon in the north, and Monmouth in the south of Wales. [pink] Monmouth being the adjacent county to Glamorgan [blue] which recorded the first JONES surname in Wales. Interestingly, Carnarvon is the first county in the north to record a JONES surname. This county was a strategic location to control the Welsh in north Wales. Any other thoughts regarding this set of facts, please post.
From: Lists and Indexes, No. LI., List of Early Chancery Proceedings, Vol. III., Public Record Office. The numbers [1016/59] records the file no., followed by folio (page) number of the case. Research by The Jones Genealogist, and published in previous issues.