Perhaps you knew this, but it is new to me. I just received the following letter that says that an early variation on the spelling of Dumond was Dupont.
Pierre Jean DuPont (Dumond)and Anna Maria Fredericka Richter had three daughters: 1) Catherine Ann b 18 Sep 1770, m 10 Jan 1790 at Schoharie Ref Ch to Heindrich Dietz 2) Elizabeth b Apr 1783;m 30 Jun 1801 Lutheran Ch, Schoharie to Frederick Swart.Witness were Henrich Dietz and George Comman. 3) Marietta b 1788, m Caleb Lyon On 1789, Oct 17, at the Beaver Dam Reformed Church, Rensselaerville, Albany Co, NY, Peter Jan duPont and Maria sponsored the baptism of Peter Jan Dietz (born Oct 15), s/o Henrich Dietz and wife Catherine DuPont [source: Vosburgh p10].
1790 Federal Census, NY, Albany Co, Rensselaerville, lists a Peter J. Dupong with; one male over 16, one male under 16, four females (which would be Pierre Jean, his wife Anna Maria 35, and three daughters; Catherine Ann 20, Elizabeth 7, Marietta 2).