There’s currently 5090 confirmed exoplanets and 8912 more candidates. There’s more discovered every day. With that kind of volume, it’s not worth the effort that coming up with that many “cool” names would take, so they’ve resorted to basically an indexing/cataloging system rather than actual “names”.
https://exoplanets.nasa.gov/discovery/exoplanet-catalog/
Also consider that these names, like “J1401b” are kind of like placeholders for the sake of easier indexing. If we do a bunch of research and end up establishing a base there or something, it will very likely be given an “actual” name.
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