The Descendants of Robert Gallaher

I am researching the Gallaher family from Donegal County Ireland. Specifically the family of Robert Gallaher and his wife Margaret Hamilton, who lived around 1750's. They together had several children: John, Robert Jr., Moses, Jane and Martha are the ones known as of now. Most of the information I have currently is on Roberts sons. John Gallaher, who married his first wife Mary Allen in March of 1797 and his second wife Martha McKnight in November of 1802. John and Martha had 13 children. Robert Gallaher, Jr. who married his wife Sarah Evans on December 11, 1812, and they had 7 children. Both of these families resided in Cecil County, Maryland. I am seeking any information their descendants which also include surnames listed below.
Surnames in my research include: Adams, Alexander, Allen, Amstead, Arbour, Ayers, Balaguer, Baldwin, Barnes, Barto, Batchelor, Benham, Biggars, Blackson, Blackwell, Blake, Bogsford, Bolden, Booth, Boyd, Bridges, Brown, Browne, Burdette, Burke, Butler, Calloway, Campbell, Cann, Carper, Chandlee, Chaputtei, Clagett, Cloward, Cole, Collins, Courtleigh, Covington, Cox, Coyle, Davidson, Davis, Dean, Drake, Dunn, Eagleston, Evans, Ferron, Ficcio, Finegan, Fisler, Fleming, Floor, Foden, Foster, Fox, Freeze, Gallaher, Gargan, Graham, Grant, Giffenberg, Griscom, Hamilton, Hanna, Harlan, Harrington, Harris, Harvey, Hassler, Hayes, Holt, Howard, Jones, Kemon, Kentner, Ketterman, Kimble, Kirk, Koczella, Kohlmeyer, Lange, Laury, Lynch, Mahoney, Maloney, March, Martenis, Matchett, Mattei, McCall, McCauley, McClerey, McCrea, McCullough, McGinnis, McIntire, McKaig, McKeown, McKinley, McKnight, Merritt, Mertz, Miller, Moffitt, Moore, Morris, Morrison, Mulligan, Nohh, Noland, Nonnebacher, Nowland, Osborn, Peterman, Pierce, Pinder, Preston, Price, Pyle, Rigby, Roche, Rose, Russell, Rybinski, Salmon, Scott, Shaw, Simpers, Sipple, Six, Smith, Spooner, Sproat, Steele, Strickland, Summers, Swedziak, Talley, Thompson, Tong, Tufaro, Tyson, Walter, Watson, Wells, White, Whiteman, Whitenach, Wilds, Wilson, Wise, Wolfe, Zebley.

Any information would be greatly appreciated. I am also willing to share the information that I have. Thank you.