Manorhamilton Leitrim Ireland

I am looking for information on the Williamson family who came to the US from Manorhamilton, Leitrim, Ireland in the 1820s. Names include John Williamson b.abt. 1788, William Williamson b. 1812, Rebecca Williamson b. 1816, John's wife Ann McClure, John's parents: John and Jane (Cullen) Williamson, John's brother William b. abt. 1785. Jane Cullen's mother may have been Mary Highland. John (1788) and William (1785) were shoemakers. John was a loyal adherent to the Church of England.