Well, to be fair I've sometimes called her Kim well before Yu-na appeared on the scene
When I mention Yu-na I *usually* refer to Kimmie as "Kimmie" or "Meissner". But, for instance in the US nationals discussion folder I imagine it's ok to call her Kim because Yu-na is not American Or if I do call Kimmie Kim, I'll call Yu-na "Yu-na" - in other words I wouldn't say Kim, Kim and Asada
BTW if it's ever unclear who I am referring to feel free to say so. I won't bite you, I promise