If this happened near or post-interplanetary colonization, I'm reasonably confident that they'd be named after or by whichever corporation buys and takes the largest influence over the planet.
We all know Elon wants to name Mars Planet X, so let's agree now to blow it up as soon as that happens.
Earth's name would probably be left alone. I'd imagine Google going after Saturn and maybe preserving the name too, maybe giving it a little name if they hadn't blown every word in the English language on dead projects.
Microsoft, in their lack of vision, would name Mercury Microsoft (if they're still around by this point).
I'm fairly certain dumbass rhetorical questions can qualify as shower thoughts.
Whether it's worth posting is a different question.