Why do some people call Rosalie, Rosaline?

If you means fãs of they book, then maybe thats how they see it..Like you know how people may have perceived Bella to look different or whatever, maybe it similar to that. For example, my cousins always saw Renée as mais like Rennie (lol). So it could be that. Although Ive never heard anyone call her that.

they do? well then people cant read

Perhaps they take the romeo and juliet comparison a bit too far??
i don't know why they do but some people do. Simple mistake??