de Richebourg.
Many Huguenots were of noble families, even royalty
That name is not listed among the French Huguenots...
It sounds like a German name...
Maybe there was a French variation of the name ???
Or his wife or descendant ???
Do you have another family name ???
I found it on the website you linked above here. Click on the D and scroll down. (Surname - de Richebourg, Christian Name - Claude Phillippe)