This is not an "answer," but I find it very interesting that:
Each has a combination of consonants and vowels that add up to 6 with a sequence of vowels being 3, 4, 2 and consonants 3, 2, 4 making a total of 6, 6, 6 = 18 letters consisting of a total 9 vowels and 9 consonants.
Fun with alphabet...