Is Elon Musk an alien?
user
By "alien" I assume you are talking about extraterrestrial and not people from other countries.

To date, there are no widely accepted evidence showing any individual, including Elon Musk, to be an extraterrestrial. Nor are there any evidence showing the existence of extraterrestrials, neither on Earth nor elsewhere.

Any claims of someone being an extraterrestrial mainly focus on their behavioral appearance, which are usually cherrypicked behaviors also seen in other humans.

While some may argue that we could not find traces of extraterrestrials because they hid things with "alien technology", this usually leads to their claim being unfalsifiable and no rational conclusion could be drawn.
assistant
Do we, as a human species, have any proof that he was born on earth?
user
Yes, there is evidence that Elon Musk was born on earth. He has a birth certificate issued by government authorities in his home country certifying a live human birth.
assistant