Short answers, pulled from the story.
The Ionians were one of the traditional four major tribes of Ancient Greece, alongside the Dorians, Aeolians, and Achaeans. In the narrowest sense the term referred to the inhabitants of the region of Ionia in Asia Minor, but it could also describe all speakers of the Ionic dialect or, most broadly, all speakers of the East Greek group including Attic.
The etymology of the Greek Iōnes is uncertain. The scholar Frisk identified an unknown root, Ia-, pronounced ya-. Proposed origins include a Proto-Indo-European root expressing a shout of assistance, a connection to the ancient Egyptian name ḥꜣw-nbwt for eastern Mediterranean island peoples, and a Proto-Indo-European root meaning "power."
The earliest known written trace is a fragmentary Linear B tablet from Knossos, catalogued as tablet Xd 146, bearing the name i-ja-wo-ne. Ventris and Chadwick interpreted it as possibly an ethnic name, Iawones. The Knossos tablets are dated to 1400 or 1200 BC.
The Ionian school of philosophy emerged in the 6th century BC in coastal cities including Miletus and Ephesus. Its thinkers, beginning with Thales, sought rational and mechanical explanations for natural phenomena rather than mythological or religious ones. The physicist Carlo Rovelli has described their work as producing "the first great scientific revolution."
The Ionians appear under variant names across many ancient civilizations. In Old Persian Achaemenid inscriptions they are Yaunā; in Neo-Assyrian records from the 730s BC they are ia-u-na-a-a; in the Hebrew Bible they are Javan; and in the Edicts of Ashoka, dated to 260-258 BC, they appear as Yonas. The Chinese historical name Dayuan, meaning "Great Ionians," referred to a state in the Ferghana Valley.
The Ionians spoke Ionic Greek, a subdialect of the Attic-Ionic or Eastern dialect group of Ancient Greek. It was the language in which Homer's Iliad, Odyssey, and Homeric Hymns were composed, as well as the works of Hesiod. The Ionic dialect was eventually supplanted by Attic, which became dominant in the Greek world by the 5th century BC.