Perhaps Adolphe had been orphaned/abandoned when young & brought up 'in care' so had never known his parents' names? If abandoned, could his surname indicate this was in Normandy?
Josey
Family keep telling me that Normand indicated where he came from.
I done a little bit of research and found that Normand is the french version of Norman.
Family said that there are a few different Norman's and depending on the ending of the name you can tell where they came from. Apparently they have a D or TY or TH on the end of Norman, it indicates their origin, but I haven't been able to find any research to prove that theory.
Online searches of Adolphus / Adolphe Normand always brings up lots and lots of info about Normandy.