Dunno. Some authors have called earth Tellus (a poetic Latin word for earth) and inhabitants by analogy Tellurians. Trek goes for “Earth” and “humans”. Fascinatingly the sf dictionary has an 1828 citation for tellurian. sfdictionary.com/view/120/tel...
The demonyms page of that site has also: earthan, earther, earthian, earthite, earthling, earthman, earthsider, terranian, terrene, terrestrial, and terrestrian. Terran is honestly better than all of those. Especially terrene which should be a sort of pâté.
This is all in English sf, of course. I wonder what non-English sf has done.