Earthling

He had to choose between "Earthling" and "Terran" for their demonym.

I am an Earthling.

Sometimes I fail to understand your earthling ways.

Thou art but an Earthling.

In Olaf Stapledon's book Star Maker, the Earthling protagonist befriends the creature Bvalltu from another world. They and others travel through the stars astrally, as they discover different beings.

I'm an earthling.

VVe (of all earthlings) are Gods vtmoſt ſubiects, the laſt (in a manner) that he bought to his obedience: ſhal we then forgette that vvee are any ſubiects of hys, becauſe (as amongſt his Angels) he is not viſibly conuerſant amongſt vs?

Eoꞃðlinᵹ [Eorthling], is a Husbandman, or Earthling.

And we have not imagination enough to believe, that either the Danish boors, who were earthlings (yrthlingas) in the country, or the Danish soldiers, who, as history tells us, were dandies at the court of King Canute, could, in the brief space of twenty years, have so overlaid or interlarded the pure Anglo-Saxon with their provincialisms, as to give it a new character, and thus form a new period in its history, as was afterwards done by the Normans.

VVe (of all earthlings) are Gods vtmoſt ſubiects, the laſt (in a manner) that he bought to his obedience: ſhal we then forgette that vvee are any ſubiects of hys, becauſe (as amongſt his Angels) he is not viſibly conuerſant amongſt vs?