I've heard
Corinna prn as kaw-RIN-uh, so it apparently is as ambiguous in prn as
Corinne (and the various spellings). (
Hope this doesn't completely turn you off from using
Corinna!) People who don't automatically assume the kaw-REEN prn *always* make sure to ask me how my name is prn, which is very nice, imo. ;o)