"I'm gonna guess it's pronounced something like......KAZESKEE or maybe even KAZKEE." My money's on something like "Shazeffski" (emphasis on second syllable, with the "z" having a sound like a "french j" (like in "Jacques").
(An old hunting buddy had a similar style name.)
I think you're right about the first two letters and the french "J" sound. But I don't see where you come up with the double "ff".
I'm revising my pronounciation to SHAZESKEE or SHAZKEE, with the Z being the same as the french J.