If your Surinam-Cherries are seedlings, they are NOT named varieties, until they have fruited, been considered special in some nice way, and then provided with a fresh new name.
Any seed produced by plant-sex (pollination) is a new variety, and will not be reproducible by seed.
Named varieties must be reproduced vegetatively: by grafting, by air-layering, etc.
The 'Zill Dark' was selected by Dorothy Zill (wife of the founder of Zill Nursery), and it was named by me, when I saved it by moving it from the original nursery when the place was sold. Yes, it should be sold as grafted plants.
It is O.K. to sell seedlings, and it is O.K. to identify which tree the seed came from, just so it is worded to make clear that these are not that named variety.