ypsilon

Y < ע < 𓁹 > 𐤏 ʿayin > ʿen according to https://en.wikipedia.org/wiki/History_of_the_alphabet

𓁹 eyen < Augen ≈ IGI 𒅆

Y < ĞY < ǦY < G 𒅆

alphabet-change

𐀂 ≈ Y ≠ Υ ≠ Ⲩ ≠ 𐘞 !

𐘞 ˢypsilon syllable 'SA'
𐊄 ᵍypsilon lycian letter G

Even though the same sign, all have different phonetic values, in a series of corruption and adoption:

υ consonant corrupted into silent (semi)vowel γ ⇨ gj ⇨ y j ⇨ i …

Y had strong affinities with G and R, so what were its original phonetic values?

Υ ˠypsilon ˠ velar γ ?
Υ gˤpsilon pharyngal ˤ ħ ?
Υ gḫrypsilon laryngeal h₁ h₂ h₃ ꜥ Ꜥ ʿ ?
Υ secondary articulation?

The y question is strongly related to the ע ⋍ غ question.
The y question is strongly related to the epsilon question.

Gaza was written as עזה and is today mispronounced as עַזָּה 'áza.

Υ may have been adapted as gḫy ghy ǧy dj dg gs ע ⋍ γy

𐀂 Y ψ GYpsilon in gero > ᵍiero 𐀂-𐀁-𐀩-𐀄 i-e-re-u hiero "priest" 𓎳

The alphabet-change change ypsilon is similar to the the phonetic corrosion of epsilon.
As the greek grammarian observed both turned from silent(soft) to silent(inaudible).

ε < Σ soft lost s>h>i Sind>Hindi>India

Ⲩ γ/r GRᶴ > GURᶴ > YUR > UR > U (coptic)

KḪ ⋍ R component
𐌙 KHE ⋍ 𐘙 RE ⋍ 𐀩 re

ЧⲦⲞⲞⲨ •qvtour coptic Ч
четꙑре četyre Slavonic
ЧⲦⲞⲞⲨ vadou® 𐍆𐌹𐌳𐍅𐍉𐍂 fiduor f'our four ⇔ viertel
𓆑𓂧𓅱 •ᶜv.d.wʳⁿ Egyptian, probably close to coptic

eve-silon
𐘞 𐘠 𔑘 #woman oval eve

𐌙 KHE << ψ ʿpsi Kḫypsilon ע γ

Y Gabelung