Yes, those names are unusual. I was buying some seeds from this supplier anyway, and thought I'd see what some of these odd names actually produced.
zecheriana could just be a typo of zeyeriana; odehnali is listed in the mammillarias.net field number search as being discovered/named by J. Halda and coming from near San Juan de Mimbres, Nuevo Leon, but exactly what it is will remain a mystery for now. The only clue is that this location is in the area of Galeana, from which I know that pilispina, rayonensis, sanchez-mejoradae, saetigera, formosa (chionocephala), and I think a form of heyderi. No doubt there are others, but these were what I could find from Google searches.
The various seeds with minnichii or minnichiana are my attempt to find a plant that I had some 10 years ago, which was named as M. minichii no field number, and was apparently a natural hybroid between louisae and blossfeldiana, having the body of the former and the flowers of the latter. It died, and the ursery I bought it from has long since closed, and no-one I have yet met appears to have such a plant.