Which Cyclops's name means 'Lightning' in Greek?

Steropes was the Cyclops whose name means “Lightning” in Greek.

Hesiod describes three primordial Cyclops brothers: Brontes, Steropes, and Arges. Their names are closely tied to the thunderbolt they craft for Zeus: Brontes means “Thunder,” Steropes means “Lightning” or “flash of lightning,” and Arges is associated with brightness or the shining bolt.

The Cyclopes were children of Uranus and Gaia, and they were brothers of the Titans and the Hundred-Handers. Uranus imprisoned them, and Cronus failed to release them. Zeus eventually freed the Cyclopes during the war against the Titans. In gratitude, they forged Zeus’s thunderbolt, Poseidon’s trident, and Hades’ helmet of invisibility.

Steropes is easy to confuse with Brontes because both names evoke storms. The distinction is that Brontes represents the sound of thunder, while Steropes represents the visible flash. These Hesiodic smiths are also different from Homer’s Cyclopes, including Polyphemus, the one-eyed shepherd encountered by Odysseus.