So now we have Next, Nuxt, and Nyxt. What’s noxt?
Well there's still two more vowels[1], so at a guess ... Naxt and Nixt?
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[1] I've never understood why 'Y' is not a vowel.
The word "eye" is an interesting one. It seems to be only vowels, based on pronunciation.
Not a hard rule, honestly.
Some Indian languages exhibit a blurring of sorts with Ye- sounds. E.g., in Telugu, the word for 'How' is 'yela', which is often also pronounced as 'ela'. TBF, Telugu also blurs Ve-/We- sounds similarly.
I dare say its made up as it goes along
Some letters always represent vowel sounds.
Some letters never represent vowel sounds.
Some letters are the letter Y