Peachy, by convention, usually uses the first name used for a model (especially the archives). When Katya D was first introduced by MET way back 10-26-2002 in a series titled "Arcadia" she was simply identified as a Ukranian model. MET did not name most of its' models then. That is how the name stuck. I know she is now identified by MET as Katya D but then MET has also sometimes changed the names it uses for its models. Take Vika AC for example, she has been called Misha, Isabelle, and Vika. With MET you simply have to adapt & keep your files current.
You will note that Peachy now uses lots of AKAs to try to take care of the problem of models working for different sites where they are know by different names. Unfortunately, that does not always hold true to the archives, but I truly believe the mods that work this board try their best. In fact, they are pretty amazing. My hat's off to them for their work.
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