Short answers, pulled from the story.
Robert S. P. Beekes notes that Frisk isolates an unknown root pronounced ya- for the word Ionian. Some theories suggest a Proto-Indo-European onomatopoeic root meaning a shout uttered by persons running to the assistance of others.
The fragmentary Linear B tablet from Knossos dates to 1400 or 1200 BC. These tablets pre-date Dorian dominance in Crete if the name refers to Cretans.
Displaced Achaeans moved into Aigialeia which became known as Achaea before expelling the Ionians from there. The Ionians moved to Attica and mingled with the local population before emigrating to the Asia Minor coast to found historical region Ionia.
Neo-Assyrian Empire letters from the 8th century BC record attacks by what appear to be Ionians on Phoenician cities. A raid reported to Tiglath-Pileser III occurred in the 730s BC discovered at Nimrud.
Three dialectal varieties traditionally spoken in Euboea, northern Cyclades, and Asiatic Ionia existed from around 1000 BC onward. Ionic colonists from Athens founded their cities there using this literary form.