The particular haplotype R1b1a2 is one of the most common to carry the surname JONES. It is also defined as R-M269 which is the genetic marker that is tagged for this group. The following chart shows additional surnames that have been found to have the same marker [R-M269] from those who have tested their Y-DNA. The listed is given in alphabetical order for the 61 other surnames that are found to match those with the surname JONES among my own DNA study groups. What a deal!
When testing your own Y-DNA for your JONES surname, you may find that those among this list are more likely to match you than another JONES!