I say kor-IN-ah, which gets turned into kuh-RIN-ah when I'm feeling lazy. It's a nice name but will be misspelled (
Corrina,
Korinna, Korrina, Karinna...) and mispronounced constantly.
Corinna and
Korinna both work, but I really don't care for
Korinna. All of the -ina spellings should be pronounced cor-EE-nah, not cor-IN-ah.