There are about 150 places called Beauregard in France. The Beauregard name is usually given by the local geography. It designates a promontory allowing to have a beautiful look over the surroundings. It is thus not surprising to find many Beauregard Castles, for example, and many gave their name to wines.
This family is mostly known for its descendant, Pierre Gustave Toutant Beauregard, the famous South general who ordered to fire the first canon shot of the US Civil War.
I found 106 descendants of this family, including Daniel Beauregard.
Note that Toutant-Beauregard is not exactly a dit name. Most people
were using Toutant as 2nd or 3rd given name (i.e. , we have Pierre Gustave
Toutant Beauregard, whose given name is "Pierre Gustave Toutant").
(C) Copyrights 1999 Denis Beauregard