Well, I don't know the answer to your question, but I have a couple of my own.
For Chickacoo:
I pronounce it Chick-a-coo
But I often hear Chih-kak-oo
Or Sauer
I pronounce it like 'sour' as in sauerkraut
But I sometimes hear 'Sawyer' like Tom Sawyer and Huck Finn