Hello
My name is Francois Nemo, from France, my paternal lign is a subclade of S19342, the same as Deveson's. I have just tested all the Dubesses variants provided by houseofnames, The results are consistent between many of them, some triangulations are found with ligns in Maine (and overlaps with a scotland peebleshire lign). The first Nemo was born in Brest Brittany in 1875 of unknown parents (officially). It seems that a part of its ancestry was from New England and Quebec. Among others, hints of a French connection with Saint-Germain lherm will have to be confirmed, and could account other for autosomal links in the area (e.g. Lafayette). So more work will have to be done
Wishing you the best