Hi,
I searched for it in the My Hostas Database. (myhostas.be) Sometimes they list hostas that you can't find anything about anywhere else. Nothing came up except one called Minker with absolutely ZERO information about it.
I would bet that it's a name that Breck's has applied to some existing hosta (that happens at times) or that it's a non registered hosta, maybe developed by Breck's.
There's also a registered hosta, Mrs. Minky -
http://hostaregistrar.org/deta... http://www.myhostas.be/db/host...
and one called Nancy Minks
http://hostaregistrar.org/deta... http://www.myhostas.be/db/host...
But some of the new perennial vendors are simply offering up older varieties under new names.