I had a professor Fuchs in college. He pronounced it “fyooks.”
I’ve only heard it once here and once that I recall from an American, and both times it was fooks. [fuks]. But I don’t blame people at all for inserting a glide to take it further away from the naughty word.
Was his first name Con?
Jeez, all those stolen signs. The town should just sell replicas of the Fucking things.
I’ve heard of that town many times before, but that Wiki article is still hilarious. I love that this:
Is a direct, and serious, quote.
fyooks
I always get a smile out of seeing signs for “Fuchs Lubricants Ltd”.
I’m easy to amuse. 
(Also get smiles from a company who make elevators: “Schindler Lifts”)
If so, then that pronunciation is incorrect, assuming that would mean that fyooks is the same as fewks. Although I guess once a name comes to America it’s usage gets changed/bastardized.
And the winner is . . . Fyooks !
I would like to add a special thanks to the client who said her first and last name on her answering machine.
You guys are making this way too hard. Names are just pronounced the way they are spelled.
Signed,
Brett Favre
And Fuchs does mean “Fox” in German, BTW.
Also DR FUCHS OFF TO AMERICA. 
In my German classes, I was taught to pronounce the vowel the same way as the “ou” in “would” or “could” or the “oo” in “book.” And the “ch” is a K sound.
I think encountering Americans with that name, I’d initially go for “fyooks” or “fox,” just to be on the safe side.
I know this is an older thread, but I found it very interesting andfunny at times. My maiden name is Fuchs, and boy did I get it all. We pronounce our last name like Dukes but with an F. That is the most common way in the states. Fewer pronounce it Fox. I did know a guy with the last name Fox…or so I thought. We spelled ours the same. Foxcomes from the meaning. Cunning, as in sly fox or someone with red hair. In Germany, many pronounce it Fooks. I have been called back from a waiting room only to hear Suzanne…followed by a long pause. The mispronunciation that frustrates me the most is Futches. How can one get that from Fuchs. Anyway, my married name is very generic, so I don’t have to worry about odd pronunciations, even they were often incorrect followed by a red face. After telling them the proper pronunciation, I’d say, “I know what’s on your mind!”