Originally Posted By: The Pook
We would usually say glaycia, btw, without the 'sh'. It has three syllables - glay-see-uh.

With ya on that one.
Regarding the vowel swapping, I would suggest it has to do with early immigrant influence and native vowel sounds. Apart from the English settlers there were a lot of Scots and Irish and perhaps in the earlier part of last century it all seemed to ooze into our current hodgepodge we call keewee.