I went to school with a Kari she was in my class we were best friends up until junior high. She pronounced it as Carrie I had yet to meet another Kari until well after I graduated. A classmate of my younger sister's name was Kari who pronounced it as Car ee.
I have always had it pronounced Car-ee or like someone else said, it rhymes with sorry! It is SO frustrating to seldom have anyone know how to pronounce it when you first meet, but even more frustrating when people don't even try!