phaeton

The word 'phaeton' entered English in the 16th century from the French 'phaéton,' itself derived from the Latin 'Phaëthōn,' which originates from the Greek 'Phaethōn.' In Greek mythology, Phaethon was the son of the sun god Helios; he attempted to drive his father's sun chariot but lost control, causing chaos. This association with reckless driving led to the application of his name to a fast, light, open carriage in the 18th century, evoking both speed and a certain daring elegance. Later, the name was extended to early open-top automobiles, preserving the core ideas of an open vehicle designed for swift, stylish travel.

This is a loanword adopted as a single unit from French. Its ultimate origin is the Greek mythological name Phaëthōn (Φαέθων), meaning "the shining one." In English, it functions as a proper noun that became a common noun.