I learned how to pronounce this word by watching Jeopardy on tv.
Can't remember the question but I knew the answer was quinoa. When the contestant answered I was all, oooh that's how you saw it.
I had been saying: ki-know-ah.
The correct way to say it is: keen-wah.
What's even better about this story is that my sister-in-law saw the show also and made the same discovery.
Live and learn.