Thank you for the information and feedback on Alphonse.
I did a quick search on Melancon Veillon, as you I located the SSDI information. I also turned up a WWII record of enlistment of a Malacon Veillon. Born the same year, from Calcasieu parish. No other information has been found, yet. I'm thinking Bella Boudreaux's real given name is "Isabelle". Just a gues on my part as I have turned up a number of Isabelle's in that time period.
Sorry I could not be of more assistance, but will keep searching.