Sirius
The Sirius system was a capital of the Sirius Sector, and one of the planets advanced by some late Galactic Era archaeologists as the planet of origin for the human species. Between 800–900 G.E., a planet in the Sirius system was one of the ten most populated planets in the Galaxy. The name clearly comes from the star Sirius.
Read more about this topic: List Of Foundation Universe Planets