One plausible etymology is:
aqua > agua > egua > ewa > ewe > eawe > eaw > eau > o
So first the k sound changed to a g, then the initial a became an e, which lengthened to a diphthong, the final sound disappeared, the new final sound turned from a consonant into a vowel (like an oo) and the resulting triphthong reduced to a monophthong.
The elision of medial g is pretty surprising to me though.
Axolotl_cpp@feddit.it 5 days ago
Are you sure that the Q is supposed to be read like a K? It does not seem to be the case in other neo-latin languages such as Italian and IIRC Spanish
i am not a latin expert– i barelly know it in fact, btw
FishFace@piefed.social 5 days ago
Yes, Latin qu was pronounced /kʷ/, which became straight /kw/ in English. I don’t know which it was in Old French. Italian does have qu which is pronounced /kw/.
hikaru755@lemmy.world 5 days ago
Same in German
FishFace@piefed.social 5 days ago
Sorry bud, but in German it usually (though not always ill grant you) is pronounced /kv/ :) quark, quasseln, usw
Axolotl_cpp@feddit.it 5 days ago
I can confirm this as native speaker :3