Well, basically because naming things is hard. We’ve already found 5000+ exoplanets, and many more are to come. The IAU manages names of astronomical objects, and mostly they prefer formulaic designations.
However they are holding perioding naming contests for them. You can get a group to participate in the next round, just be aware they get a -ton- of submissions, so odds are it won’t be you.
https://www.nameexoworlds.iau.org/
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