Name: Suzanne/Sue Sebastopol, CA (Zone 9a) Sunset Zone 15
I have never even heard of it or the hybridizer. It's an older daylily that may be something that a backyard breeder registered and as such, may never have gotten in any kind of circulation with nurseries.
Are you just looking for a plant that contains the name "Ethan?" Or this specific daylily?
There is a daylily called Ethan Coggins that might be easier to locate. It's on offer right now on the Lily Auction.
Confidence is that feeling you have right before you do something really stupid.