Through the enterprise of the new residents, Syros flourished and by the middle of the 19th century became a commercial, industrial and shipping centre – second only in importance and population to Athens. It was named after Hermes, the god of merchants and messengers, and as its riches grew so did its thriving artistic and cultural scenes. Even today, it has a population of 12,000, giving it a year-round vibrancy.
Source : https://www.discovergreece.com