The ethereal creatures named sylphes are a fabrication of the celebrated Swiss philosopher, physician, theologian, astrologer and alchemist Theophrastus Philippus Aureolus Bombastus von Hohenheim (1493/1494 – 24 September 1541), known as Paracelsus, meaning beyond Celsus, an early Roman physician.

The word sylphes was coined by Paracelsus perhaps inspired by the Latin silvestris “of the forest” and nympha “nymph,” from Ancient Greek νύμφη (númphē, “bride”). According to the New Century Dictionary:

to occultists and quacks like Paracelsus words spelled with -y- look more Greek and convincing.

Sylphs figure in Paracelsus’ hierarchy of the four Empedoclian elements, each personified by an imaginary being. The terms gnomus, undina, and sylph are all thought to have appeared first in Paracelsus' works, though undina is a fairly obvious Latin derivative from the word unda meaning wave.

• Earth: GNOMES
• Water: UNDINES
• Air: SYLPHS
• Fire: SALAMANDERS

Sylphs are the closest to humans in his conception because they move through air, they burn in fire, they drown in water and they are mired down in earth. Because of their association with air, they have been pictured as ethereal, graceful creatures, akin to fairies. Alexander Pope mentions sylphs in his Rape of the Lock. The ballet la Sylphide, which debuted in Paris in 1832, might have inspired the use of the word to describe a graceful, willowy girl. According to the OED this meaning was first recorded in 1838 as having originated on the notion of slender figure and light, airy movement.

Marie Taglioni in La Sylphide English Wikipedia user Mrlopez2681:

Paracelsus, Waite, A. E. (trans.). The Hermetic and Alchemical Writings of Aureolus Philippus Theophrastus Bombast. London: J. Elliott, 1894, reprint New York: Random House, 1976.

The Sylph (European Classics). ASIN 0810122294

von Hohenheim (Paracelsus), Theophrast (1933). Sudhoff, K., Matthießen, W. (eds.). Sämtliche Werke: Abt. 1, v. 14, sec. 7, Liber de nymphis, sylphis, pygmaeis et salamandris et de caeteris spiritibus. Monaco di Baviera: Oldenbourg.

Andromeda has divine ancestry although her human/mortal ethnicity makes her Greek or Argive specifically. She’s the daughter of king Cepheus, of Aethiopia but Cepheus was also named lasid Cepheus or the line from a last king of Argo. Cepheus was ethnically Greek but also a descendant of gods. Some say that Cepheus’ father was Belus, a son of Poseidon, or that his father was Phoenix (this character was a man and not the same person as the winged female creature). The genealogy of Andromeda’s possible grandfathers are:

Belus and Phoenix Phoenix (son of Agenor) - Wikipedia

The mother of Andromeda is Cassiopeia and a descendant of a mythical people Lapiths in Thessaly. These were a descendant of the Aeolian tribe of prehistoric Greece, and might’ve been centaurs.