Results
The Team Liddell et al Study, which uses the 37-marker Y-DNA and mtDNA Plus tests exclusively has already revealed that: (1) All Liddells are not kin (that surname is the only to test so far as far as current useage is concerned), (2) two Liddell lines are very likely descendants of Roman soldiers sent to Hadrian's Wall, with one Middle Eastern in origin and the other from either northwest Greece (more likely) or southern Spain and (3) a third line is most likely Irish in its ultimate ancient origin.
One of of the Roman-related Liddell lines however has been traced so far to England according to reliable douments as Lyedelle in the early 1800s. That surname later evolved to Lidell, then Liddle and finally Liddell as the members moved into eastern Canada and then the northern USA.
However, this particular line believes that it will eventually trace its way back to Liddesdale as well, since its members have an oral tradition of being related to Robert the Bruce. Yet another line with no males in the Study yet but with one female already tested has solid documentation in hand of her Liddell line's Bruce-kinship through a Keith line.
Very oddly, one Liddell line has no matches at present anywhere in the world other than among themselves. This is the line believed to be Syrian in origin from nearly 2000 years ago when a company of Syrian archers was assigned to Hadrian's Wall as part of the Roman Army.
Another oddity is that one man each in one of the two always-Liddell lines and the one that is first recorded as Lyedelle has the extremely rare 484e Y-marker.