>>10
There are plenty of ways to "look German", and people, you know, do have children with others who don't share their same exact ancestry.
Either way, if going by this painting, then Immanuel Kant had similar facial features (e.g, nose and cheekbones):
http://en.wikipedia.org/wiki/File:Immanuel_Kant_(painted_portrait).jpg
You've really gotta step-up your game if your main criterion is "has German surname, but doesn't look like guys from Nazi movies".