You can name a hybrid whenever you want to.
But if you want to share your hybrid -- you will need to share only F1 seed from a cross you make. This will greatly limit your sharing, until you master crossing.
You can't share a hybrid by saving seed from a hybrid. It won't be a hybrid anymore.
Also, before you share your hybrid, it would be good if you grow out a decent sized population of the seed you think is hybrid seed -- to make sure you really have the crossing/hybrid-making process down.
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