The accepted theory that the origin of the world vowel is the Latin "vokal". Are there any solid proofs besides academic conjectures and hypothesis?

French has had quite some influence from Arabic due to the ardent French support of "crusades" towards the "holy land". I propose that the French word "vouel" from which our English word "vowel" is directly derived is actually from the Arabic character "Wau" which is directly related to the Hebrew character "Vav". Not from the latin "vokal".

At which time the crusades had caused many semitic words to creep into European usage. Where, the relationship between the words "vowel" and "vocal" is merely convenient and convincing conjecture.