One of my ancestors, Edmond du Casteel, paid taxes in Philadelphia in 1693. He is on a list of arrivees from South Carolina in 1692 with a boatload of pirates. He also married in 1693 a Quaker lady, Christian Bom, who had emmigrated to Philadelphia as a child from Holland.
Edmond is believed to have been a Huegenot nobleman from Flanders and related to the van du Chastel de Blangervals line of France.
Whatever his background, Edmond made his own way in the new world, first as a pirate, then a merchant, and finally as a privateer.
The Casteel line has been studied intently by it's many descendants. From a DNA point of view, there were at least 2 separate families. A privately printed history, by several members of our group, the Casteel Privateers, "Captain Edmond Du Chastel and the Colonial Casteels, An American History" is the source of much of my information.
There are also several recognized spellings of the name: du Chastel, du Castell, Castle, Casteel, Castile, etc.
I am willing to help in any way I can as it regards Pennsylvania and any William Penn association.