Are any of the names on the Colquhoun/Colhoun/Calhoun/Calhoon/Cahoon variation not pronounced 'Ca-hoon'?

There is a small town called Calhoun near the small town where I'm from in the Southern US, and it's pronounced "Cal-hoon," with the "cal" pronounced the same as in "California."

Native American place names sometimes have weird disconnects between spelling and speaking, probably not much stranger than Gaelic or Welsh.