Earthborn

Earthborn was a term used to refer to humans who were born on Earth, the homeworld, rather than the colony planets. (PROSE: Ten Little Aliens)

The mother and father of the Lady Cassandra O'Brien.Δ17 were both born on Earth. Just prior to Earth Death in the year 5,000,000,000, Cassandra recalled that her parents were the last to be buried in the Earth's soil. By that point, Cassandra believed herself to be the last "pure" human. (TV: The End of the World)