The Fultons: Scotland then Ireland then North America

I've always been puzzled that our patrilineal ancestor John Fulton coming from Ireland in 1760.  It turns out that a bunch of Fultons came to Ireland from Scotland in the 1600/1700's, and their surname was actually taken to connote from where they came -- the Fulton Land (west of Glasgow).  Then many of them emigrated to North America.  One family tree in the article below does show a John Fulton in Nova Scotia as a descendant of the Fultons in Ireland, and possibly does link us very remotely to Robert Fulton the inventor.

http://neuronresearch.net/genealogy/Fulton_North_America.pdf

Figure 1.3.1-1 The distribution of Scottish settlers emigrating to northern Ireland during the colonial period.
The Land of Fulton was just to the west of Glasgow. As the people moved into Paisley, Beith and other
communities, they adopted the descriptor, de or of Foulton, with various spellings. With time, this became
just the surname Fulton. Modified from Gillespie, 1985.

Figure 1.3.2-8 Immigrants to North America from Lisburn using a simplified tree. The shading indicates
the time spent by the individual in North America. This figure omits the immigration of Rev. Robert Fulton
(1654–1720) to Jamaica and the circuitous migration of William Fulton (1810–1889).

Note from Brad Fulton: This tree is rooted on the left side of the previous diagram.  So our relationship to 
Robert Fulton is quite remote.