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The IAU naming rule for craters on Mercury is "artists, musicians, painters, and authors".

There is now a crater Bulsara in the planet's southern hemisphere: https://planetarynames.wr.usgs.gov/Feature/16280 .

I read that the nomenclature committee decided that Freddie Mercury had to be listed under his birth name rather than his legal one. Having a Mercury crater on Mercury was apparently considered to be too confusing.