I am researching John McWilliams, merchant b. c. 1660 in Dumfrieshire. He died in Philadelphia, Pennsylvania in 1719. While he had married Rose Budd of New Jersey, they had no children. John McWilliams left his estate to the children and grandchildren of his brother William and his sister Agnes. In his will, McWilliams stated that his brother William's family lived near Caerlaverock Castle. It is my understanding that some of this family migrated into Ireland. Apparently, McWilliams was not only involved in transporting goods in the Colonies, he also had contacts in London and Liverpool. His widow went on to marry Joseph Shippen, another prominent Philadelphia merchant.
There has been a suggestion that this McWilliams line is linked to a later arrival in the Pennsylvania Colony, Richard McWilliam, who came from Ireland (Dublin, Derry?) bef. 1740 and became active in Government in Delaware, which was then part of the Pennsylvania Colony. Family lore has it that his father was also a merchant? Unfortunately a link between Richard McWilliam and his ancestral family remains a mystery. Richard McWilliam was also close to Minister George Ross and his son Aeneas Ross George Ross was born in Ross-shire in 1680 and served the congregation of Immanuel Episcopal Church in New Castle Delaware.
Any information regarding these families would be appreciated.