I've seen her named Katya Kutkovckaja - but I've seen her in a couple of places called Daria.
Those three sets use the same rooms as several sets on atkingdom sites - and that's a well known Russian porn star with her (and with Kristina on those dr-hardcore pages - she does a les set you'll find on the Kristina Svedenborgckaya thread, and the mans's name if you want it!)