Dave, I'm sure I must have sent you this years ago, but for the benefit of anyone else who is following this thread, here is a list of the Vances I've found who originate in Lisfannon:
1) Lisfannon, Fahan, Donegal
(2) Henry VANCE [135]
b. ca 1749, 30 yrs bef marriage/children
Orig. Desertegny Parish, Fahan Upper, Co. Donegal
& Lettice [135]
(2) George VANCE [2], [270], [45], [250]
b. 1753, Donegal
d. 26 Jul 1847, Orangeville, Columbia Co., PA
br. McHenry Cemetery, Orangeville, PA
em. 1804 [250]
occ. teacher
Orig. Meenalooban, Desertegny, nr Fahan [949]
rel. CoI
& Martha CHAMBERLAIN [250], [949], [135], [2], [45], [270]
b. Scotland
d. 26 Sep 1823, Orangeville, PA
rel. CoI
m. 2 Sep 1783, St. Columb’s, Co. Derry [135], [949]
(2) John VANCE [135]
b. ca 1790, by deduction
(2) William [135]
b. ca 1790, 30 yrs bef marriage/children
& Matty [135]
(2) John VANCE [135]
b. ca 1791, 30 yrs bef marriage/children
& Martha [135]
(2) Charles VANCE [364]
b. ca 1796
d. 31 May 1851, Lisfannon, Fahan Upper
(2) Alexander VANCE [135]
b. ca 1811
d. 21 May 1875, Burt, Co. Donegal
Orig. Figary Fahan
& Anne [135]
(2) Andrew VANCE [135], [790], [789]
b. ca 1826, 30 yrs bef marriage/children
occ. farmer
Orig. Lisfannon
Sources
2. “Vance/Vans/Wentz Y-DNA Project,” Adam Bradford (adam.bradford@gmail.com), http://www.vancegenealogy.com/index.php, now at https://www.familytreedna.com/groups/vance/about/results.
45. “Ancestry.com,” Historical Records, some original, some transcribed, http://search.ancestry.com/search/, http://search.ancestry.com, England and Wales, Civil Registration Index: 1837-1900, Census returns, 1861, 1871, 1881, 1891, 1901, US census and BMD records, 2003 and subsequent.
Published by permission of the Controller of HMSO and the Office for National Statistics
135. “Irish Family History Foundation (IFHF),” http://ifhf.rootsireland.ie/, http://ifhf.brsgenealogy.com/map.php?&set=yes.
250. “COLUMBIA COUNTY, PA BIOGRAPHIES, BLOOMSBURG,” http://www.jowest.net/research/CCBios3a.htm, Oct 27, 2008.
270. “Orangeville, Pennsylvania, United States of America,” http://Gedcomindex.com, Oct 28, 2008.
364. Lindel Buckley, “Donegal Genealogy Resources,” http://freepages.genealogy.rootsweb.ancestry.com/~donegal/, Jun 15, 2009.
789. “Marriage Register 1845 to 1902, Fahan Presbyterian Church,” http://www.fahanchurch.org/marriageregister1871to1902.htm, Aug 13, 2010.
790. “Irish Genealogy,” Department of Tourism, Culture and Sport, Ireland, http://www.irishgenealogy.ie/welcome.html, Aug 15, 2010.
949. Dave Vance, “Vance book - Part I now completed,” 25 July 2011, and other emails. And, “Vance History Online,” http://vancehistoryonline.blogspot.co.uk/