I recently found the following information which seems to be about the Conrad Dubois who founded the various Deboy/Depoy/Dipboye/Depboye families:
[From: Memorials Of The Huguenots In America, by Rev. A. Stapleton, A. M., M. S.; Carlisle, Pennsylvania, 1901.] "The famous Seventh Day Baptist Community [EPHRATA], founded in 1725 at Ephrata [Berks/Lancaster, PA] by Conrad Beissel and composed of Sabbatarian and Pietistic refugees of various nationalities, had also among its members some of Huguenot antecedents.Among the number was Conrad DuBois, who arrived in 1728 and whose wife died at the Cloister in 1737. The name does not subsequently occur on the records of the Community. In 1757 the will of Conrad DuBois, presumably the same individual, was probated at Reading."
"The Registers of the Ephrata Community" by Julius F. Sachse in Pennsylvania Vital Records: from the Pennsylvania Genealogical Magazine and the Pennsylvania Magazine of History and Biography, Volume 1, pp. 163-178. (Baltimore: Genealogical Publishing Co., Inc., 1983. THE SECULAR CONGREGATION. "German Seventh-Day Baptist Congregation." REGISTER For the Brothers and Sisters who in and without Ephrata Community died. [among others]1737Conrath Debahe Helpmate
If this is the right Conrad Dubois, then Elizabeth was his second wife.This would explain why his children with Elizabeth seem to have been born after about 1740.