valleylynn said:Okay, I found out that Mint Marvel went from 'Mrs. Giuseppi' to 'Sir William Lawrence' because of rot problems in 'Mrs. Giuseppi'. I'm not sure when the switch took place. 
Thank you Chris (goldfinch4) for the reply.
I'm sure, even given the terribly unfortunate and increasing practice of rebranding existing cultivars under new trademark names, that it totally violates trademark rules to simply swap in a different true cultivar name with another one because the initial cultivar selection was a poor one. Where will this nonsense end? It seems that cultivar names are going the way of "fake news", why is this happening? It's an abhorrent development and an affront to Linnaean binomials and the Code of Nomenclature.
