Hi !!!
Thessaly comes from Thessalia.
But Thessalia comes from Tessares + Ellás.
Tessares means "four" because Thessalia was devided into four districts.
Ellás (or Hellás) is well known because it was the ancient name of Greece. But it has a meaning too.
Goddess
Ella (or hero Ellas) were the ancestors of Ellrnic people.
Other Etymology of Ellas is Sellas that derives from Selene+Ellas.
Selene was the goddess of the moon so Ellas mean "where the moon is venerated" or "lunar land, barren land".
...
So Thessalia (and Thessaly) mean simply "four lands of Ellas people" while literaly "four lands where
Selene is venerated" or "four barren lands")
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