It depends on what language you are talking about. In English, the letter X is least used for first names.
G and H
The 14th letter of the modern Greek alphabet is xi. It is written uppercase Ξ, lowercase ξ , and the Greek name for the letter is ξι.
The ninth letter of the Greek alphabet is iota. It is written uppercase Ι, lowercase ι, and the Greek name for the letter is Ιώτα.
Cuba
X and Z , Y or Q and u
Alez
Alpha is the first letter of the Greek alphabet.
The letter A is the first letter in the Latin alphabet. Its name in English is a (pronounced /eɪ/), plural aes, as, or a's. The first letter of the English Alphabet.
American Bobtail
G and H
The name of the first Arabic letter is A. It is shaped like an italic l.
"first", or "the beginning". It is the name of the first letter of the Greek alphabet.
e
The Hebrew name of the 22nd (and last) letter of the Hebrew alphabet is Tav (ת) but it doesn't have an English name, only a Hebrew name.
The family go to the 'Gurdwara' (Sikh temple) and get a letter from Gurumukhi (thepunjabi alphabet.) They then use that letter to become the first letter of the babies name, and think of the rest of the name themselves.
The 14th letter of the modern Greek alphabet is xi. It is written uppercase Ξ, lowercase ξ , and the Greek name for the letter is ξι.
The ninth letter of the Greek alphabet is iota. It is written uppercase Ι, lowercase ι, and the Greek name for the letter is Ιώτα.