According to Thomas Keightley, the word "fairy" derives from the Latin fata, and is from the Old French form faerie, describing "enchantment". Other forms are the Italianfata, and the Provençal "fada". In old French romance, "fee" was a woman skilled in magic, and who knew the power and virtue of words, of stones, and of herbs.
Faie became Modern English fay. Faierie became fairy, but with that spelling now almost exclusively referring to one of the legendary people, with the same meaning as fay. The word "fairy" was used to in represent an illusion, or enchantment; the land of the Faes; collectively the inhabitants thereof; or an individual such as a fairy knight.
To the word faie was added the suffix -erie (Modern English-(e)ry), used to express either a place where something is found (fishery, nunnery) or a trade or typical activity engaged in (cookery, thievery). In later usage it generally applied to any kind of quality or activity associated with a particular type of person, as in English knavery, roguery, wizardry. In the sense "land where fairies dwell", the distinctive and archaic spellings Faery and Faerie are often used.
Fairies, in the fantasy series Artemis Fowl by Eoin Colfer, are fictional beings, usually shorter than a human, who possess magic properties. The average height of a fairy is exactly 1 metre, one centimetre. All the fairies have retreated below the Earth to escape the destructiveness of the human race. Their underground civilization is centered on the capital city of Haven. Fairies are vernacularly known as the People, and live a life according to the Book of the People. There are 8 recognized families of fairies- Elves, Dwarves, Pixies, Gnomes, Gremlins, Goblins, Sprites and Demons. However, the centaurs have been mentioned several times, as with trolls, and the centaurs' cousins, the unicorns, were killed off, yet they are not recognized.
Races of Fairies and the eight families
The Eight Families
In Artemis Fowl and the Lost Colony, it is said that 10,000 years ago, there were eight families (or species) of fairies. It is possible that Centaurs and Trolls used to live not underground but above ground, and were recruited by the fairies for the war against the Mud People (the term used by fairies to address humans). This would explain the links between many animals these two species have, and would explain why they don't have magic. Centaurs are also cousins of unicorns, so they couldn't be in the fairy family without the unicorns. The fairies, however, are mostly humanoid.
Warlocks are also part of the fairy world. They are extremely magical fairies that originate under unknown circumstances.