its named usually after a particularly successful player who employed it successfully or after a particular region or event etc it was used prominently. e.g. the grand prix attack
I haven't invented an opening, but if I had how would I get it named?
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Write and self-publish an e-book on it, and spam the ever-loving hell out of chess communities with it.
Give FIDE $1 million on condition that they name an opening after you.
Simply curious