I have noticed that a lot of lilies have been taken by certain (unnamed) growers and sold under their own given names to avoid paying royalties where due.
The photo of "Starburst" on the Thompson & Morgan site looks amazingly similar to Nymph. Friso, I have been told, is really Silk Road and there are many other examples. There is also the problem of people naming their plants without checking the Registry. There were some beautiful lilies at the show in Burlington last year that had been entered by their hybridizers that were passed over because they had been named the same as another registered plant. The entire registry is not accessible by everyone and I have noticed that the online site is now looking for a new host and no longer fully functioning.