Many more descendants are given in Hanna of Castle Sorbie by James A M Hanna, plus a sketchy ancestry giving the male line only back many generations in Scotland and Ireland, but with no references.
Somerset Co PA Genweb site has: HANNA FAMILY OF PETERSBURG (ADDISON) PENNSYLVANIA
Alexander Hanna Sr was born either in Scotland or Ireland in 1737, emigrated to America in 1771 and settled in York Co PA. In 1798, Alexander, and his wife Martha, their four children and three grandchildren moved to Milford Township, Somerset Co PA. Alexander Sr died in 1809 and was buried at the Cross Roads Cemetery near Harnedsville. He was a veteran of the American Revolution.
Submitted by: Lawson L. Duckworth for the "Old Petersburg-Addison Historical Society" who compiled this information. (firstname.lastname@example.org)
User ID: F2974A826EE441A899AEF57C3729D433AFEB
Date: 7 JUL 2010
Prior to import, this record was last changed 7 JUL 2010.
Text: History of Bedford, Somerset and Fulton Counties, Pennsylvania. Chicago: Waterman, Watkins & Co., 1884.
Text: James A M Hanna. Hanna of Castle Sorbie, Scotland, and Descendants. Vol. I. Ann Arbor MI: Edward Brothers, 1959.
Text: Historical Collections of Harrison Co (IN), title page not in my files, p 508.
Text: Tombstone Inscriptions of Cemeteries Somerset County PA, Volume II,
Text: "Hanna Family Settled in York Co," Laurel Messenger, May 1977, p 3.
Text: "Cross Roads Burial Ground," The Laurel Messenger, Feb 1985, p 156.