I made this post like a year back and my reasoning was absolute dogwater, so I'm giving it another shot.
So Star Wars is said to be a "long time ago", but Earth also existed a long time ago, so it could've existed in its earlier stages. Plus, there are unknown regions in space in Star Wars, so even though it's unlikely, it could exist there. Star Tours also implied the existence of Earth in Star Wars, and as far as I know, Star Tours is Canon (I could be wrong). Also, IIRC, "Earth" is used as a term in Star Wars to refer to any given land, so it must have some origin.
Also, don't bombard the comments section with "Earth doesn't exist in Star Wars". That would be a waste of time. Anyway, back to Earth.
The evolution of humans actually conflicts with regards to the real world and Star Wars, but that would take waaay too much time to discuss, but I'll probably discuss it later in the comments. In the Vow of Sliver Dawn, Earth is actually the capital of the Heaven System, so a connection is not impossible but is still doubtful. I mean, why would they name a planet the same name as another? Also, despite being non-canon, Han and Chewie DID actually land on Earth. I just brought this up since we are discussing Earth, even though it has no relevance to Canon or Legends Canon. Is it also a coincidence that Enviro-suits in Legends look like astronaut outfits from Earth? The Enviro-suit designs are actually Canon in Legends, unlike the Han and Chewie story I mentioned earlier.
If you wish to see my old post, here it is: https://starwars.fandom.com/f/p/4400000000003398731
