Cygnus
the swan; the Northern Cross
Today this word meansA cross-shaped constellation flying wings-spread along the Milky Way.
The best-known version makes it the swan Zeus became when he approached Leda.
Another version says it is Cycnus, the friend who searched for Phaethon after he fell dead into the river, and grieved himself into a swan.
Deneb, the bright star at the tail, is simply Arabic for "tail."
Worth noting
Which swan it is has been disputed since antiquity. When stories are attached to constellations after the fact, this happens often.