Joy, I know it has been a long time since your post, but I think I can give you a bit of info. Joseph Burwell Longuevan, who married Lucy Alma Keith in 1911 and had children Donald and Jewell
Donald, b 18 MAr 1918, died in Grand Junction CO 18 June 1996HIs wife was Cecilia, b 24 JAn 1913, D 18 DEc 1998, also Grand Junction, CO He had 3 children, Donna, David and Clair. Clair married--his wife is Mayanne they have been missionaries for over 40 years, traveling the world.They lived for many years in Mali Republic. They have children Iris, Jewell, Sonya and Nathan.
Clair told me that when he was living in Switzerand, while studying the French language, he learned that the Longuevan family were hugenots from the Onge area of western France, who fled France, and lived in Switzerland, eventually coming to the US and settling in St Louis, MO.They spread out from there to NM and California.
As I checked out what I could of the family on the internet, I found that his information appears to be logical and accurate as far as it goes. fell free to write me if I can help any more . LuAnn