I'm interested in your family because my name is Cazalet and my ancestors are from Sommieres, Languedoc, France.
I estimated that your Pierre Casselet was born in Languedoc about 1710. I think my ancestors, Noe, Pierre and Jean, Huguenots, fled Montpellier, France about 1700 and ended up in New York City.
Do you have any more information about your Pierre and his wife, Marguarite LaSalle?