Roulette, Black Jack

just to make a start

Not an expert on the subject myself, but try searching for "Spielbank", not "Casino", and possibly combined with city names (e.g. Baden-Baden, Kassel, Wiesbaden, Dortmund) that should get you closer.

As far as I know, most games should have the same name; but not sure how common any of them are (apart from Roulette, that is iconic).

http://de.wikipedia.org/wiki/Spielbank

Oben ein Linktipp.
Poker, Baccara

Zusammen mit #1 war es das.

http://de.wikipedia.org/wiki/Spielbank#Angebo...

(Or just take the list from the wikipedia article, without doing additional reseach - depends on for what you need it...)