Earther
Earther or Earthling was used as a derogatory term for Humans in the 23rd century. The term Earthling was also used in 20th century science fiction as a term for Humans from Earth.

 defended Jonathan Archer to T'Pol, saying that although his captain was a "simple Earthling", he was competent nonetheless. ()

A young Spock was called "Earther" by his Vulcan playmates because he was half-Human. ()

James T. Kirk and Leonard McCoy used the term Earthling when discussing the possibility that Charles Evans was a Thasian rather than an Earthling. McCoy felt it was unlikely, unless Thasians were exactly like Earthlings. ()

The Gorn captain referred to James Kirk as an "Earthling." ()

The Excalbians also referred to Humans as Earthlings. ()

Korax, a Klingon officer visiting Deep Space Station K-7 in 2267, referred to the Starfleet officers there as "Earthers." ()

Lucien called Humans Earthlings, speculating that he liked them for their curiosity. ()

Demos speculated that a Dramian had attacked Kirk because Kirk was an Earthling like McCoy. ()

Kirk was called Earther by the Orion crew who had seized the . ()

Nog referred to Humans as Earthlings in 1947, saying the Ferengi had been studying them for years and felt they were ripe for conquest. ()

When Tom Paris was briefing Kathryn Janeway on the technology of The Adventures of Captain Proton, he told her to remember that it is a "ray gun, not phaser. Imagizer, not viewscreen. Earthlings, not Terrans." ()

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Slang
The Adventures of Captain Proton
Insults