I have an Andrew Hahn in my file --perhaps the same as you are searching --below is what I have on him --if this sounds familiar to you I would like to share/compare info with you on this line
Birth year before 1744 based upon will of Loudwick Haun which names Andrew a co-executor of his will with his wife, Katrina. Andrew would probably have been age 21 or older when the will was written in April 1765.
1765 Will of Loudwick Haun of Pipe Creek, Frederick Co, MD probated on 20 May 1765 & proven by Phillip Beamer and John Kessler, two of the subscribing witnesses. Named in will: wife Katrina; sons Andrew & Johanathan; daughters: Margaret (under age), Katrina. Another person, Devault Hahn was also named without stating a relationship, if any, but all sums to be paid when "they" arrive at full age, as the law directs.
1824 Will of Andrew Hahn dated 6 Jun 1823 probated 8 Jan 1824 in Columbiana Co OH Case No. 661, named wife Elizabeth, sons: Solomon, Benjamin, Andrew, Isaac, Samuel, Joshua, Israel; daughters: Margaret Flege of Frederick Co MD, Catherine Hahn, Magdale Arter; Elizabeth Grase and Eve Cover. Witnessed by: Tho. T___, George Elsen, John Stump & John Coblentz.
Buried Old Springfield Cem Mahoning Co OH (stone destroyed)
Andrew b. bef 1744 Md and died 1823 Columbiana Co.Oh. married Elizabeth Powell 1748 Frederick Co., Md to 1-11-1842 Stark Co., Oh children: Elizabeth 1785, Magdalena 1772, Catherine 1774, Solomon 1777, Benjamin 1779, Andrew 1781, Eve 1786, Isaac 1788, Samuel 1790, Joshua 1795, Margaret 1770, israel 1796
Elizabeth married William Grace their daughter Anna married Hezekiah Burns and were my 2nd great grandparents