Possibly an H. x brizoides cultivar but same as with the hosta there are numbers of these on the market now - with new ones coming out all the time. Combing local outlets and comparing samples of yours with ones found there might be the best bet.
Yes: I also noticed possible indications of bigeneric hybridity in inflorescences and leaves, this would also be resolved by examining stock in nurseries until the same introduction was found. Not as many of these as hosta cultivars so probably a pretty good chance of finding the same one fairly quickly - at this time of the year.
