Because we’re discovering potentially thousands to millions of exoplanets, we need efficient names, so for, say, WASP-96b, it was the 96th star system cataloged by the WASP survey, and iirc we start at b for the naming convention because the star is given the undeclared “a” as it’s designation
There are lots of exoplanets with proper names, though, [here’s the list](wikipedia.org/wiki/List_of_proper_names_of_exoplanets)
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