The ancient Latin alphabet did not include the letters U, W, and J and question could be raised of how to associate these letters with Chaldean numerology. It is clear that the letter U developed from the letter V, which in turn originated from the Semitic letter waw, which has the value of 6. It is also evident that U is always used as a vowel.
The letter W also evolved from the letter V. Its original notation was V V, or UU, with a numerical value of 6+6=12. Over time, a new representation of this consonant 
became established, which, due to its connection with the letter waw and the sound “w,” has the value of 6.
The letter J developed from the consonant yod. Although this letter is pronounced differently by different peoples, it therefore carries the vibration 10, or the reduced value of 1.
The letter Y, which also originates from the Semitic letter yod with values of 10 and 1, was present in the original Latin alphabet, unlike the letters mentioned above. The question arises as to when it should be considered a vowel and when a consonant.
Some Chaldean numerologists are now convinced that the letter Y should always be considered as a vowel. In the name “New York,” for example, Y would be considered when calculating vowels, even though it represents a consonant in this case.
Since the letter Y originates from the letter Yod, its original vibration is actually that of a consonant. While Y can be used to represent both a vowel and a consonant, its fundamental nature, due to the original vibration of the letter, remains primarily that of a consonant.
The distribution of these effects is not entirely clear, but the concrete results suggest that Y should fundamentally always be analyzed as a consonant, even when Y is associated with the vowel sound “ee.” In the case of Mike Lynch, for example, analyzing the letter Y as a vowel would lead to the loss of all indicators pointing to work with software, resulting in an incorrect analysis.
The Mystery of Numbers, Luck, Worlds and Planets 