Why are vitamins named the way they are? (A, B, C, D, E and so on)

They are just the abbreviated full names: Vitamin Alfredo, Vitamin Beef, Vitamin Cheese, Vitamin Deez Nuts, and Vitamin Egg

There’s no vitamin F.

They were labeled alphabetically based on when they were discovered. Also, Vitamin D's label was a misnomer as it's converted into a vital hormone needed for the body to properly function.