Speaking of which, there’s actually a fairly compelling theory that Tattoine is the human home world in Star Wars. We know a few things about the origin of humanity in Star Wars, but it’s all from the time humanity was an unimportant slave race to the Rakstan Empire. We also know Tuskens are later biological descendants of humans that genetically split after the Rakatans fell, and that the Rakatans directly raided Tattoine for slaves, meaning Tattoine was at least one source of original flavor human when it was still a relatively minor species in the galaxy.

The other in-galaxy option is Coruscant but honestly that’s kind of boring. It’s also quite far from Tattoine so it’d be weird if Tattoine was just some random human colony.

And the technically movie-canon answer is Earth and humans are an exo-galactic invasive species but that’s not as fun.