I did some searching, because the name Herres did ring something. I remembered that we have a journalist in german TV with that name.

The name is most common in germany in the south-west, from the town of Trier south into the state Saarland and east along the Mosel river into the Eifel.
Trier and Saarland are located near/at the french border.

One origin for Herres may be a "place name" shortened from the village Herresbach. Those names are not unusual in germany. My last name Eichelberger is in the same catagory, meaning "the one from mount (berg) acorn (Eichel)".
A guess from me: Herres could also be a Huguenot name, like for example Hebert.

To the COA is cajunscot IMO spot on, I don't think it's a german COA.
In addition I have my doubts regarding the motto. I think it was drawn later to the COA. The style of the banner and the font don't match the overall design of the drawing. The banner is just too modern.