Yes, she is Joana there, but I call her Payton from her 21sextury scenes. All these russian cuties have so many different names I pick one and stick with it for all scenes and my hard drive.
The important thing is to stay consistent with the name used for a specific scene. As you say, it's already complicated enough, so the basic rule is to make clear which name is being used for the scene you are refering too.