Could someone merge them please?
So it's Van den Plas, van den Plas, Vanden Plas, Van Den Plas, and even Vandenplas. Still, they make nice chocolates and frites.
I just checked the Wikipedia entry - the company was first called Carosserie Van den Plas, but the family name is spelt van den Plas (which is I would expect), but after that the website calls them Vanden Plas. So that doesn't help much.
Strange things, these Flemish and Dutch names - reminds me of the Dutch striker Jan Venegoor of Hesselink. Try getting that printed on the back of a shirt.