Uhhuh... Suspension of disbelief was the first thing you should have left behind when watching this show. The author is no better writer than Terry Goodkind, yet unlike Goodkind, he somehow imagines he has a sense of humour. I bet he simply thought it would be terribly funny to name the princess Pina Colada, and that's it. It never must have visited his mind just how stupid it would look. But then again, seeing how the Emperor treated the poor girl, sending her and her knights on a likely suicide mission, I'd personally like to think the Emperor gave her a stupid name on purpose (ignoring the fact it's an alien world and also historically kind of too early for fancy, named drinks).

That being said, it didn't bother me overly much. If I let such a tiny thing bother me, I couldn't keep watching this for all the bigger problems.