westerners, how do you pronounce the letter "w" do you say dablu or double you or just dub or double v?

I looked into it once before, the short answer is because the letter predates the distinction between "u" and "v".

Edit: Here's a comment I made a while ago on the same topic with a little more information: https://lemmy.world/comment/10659648

I think it's because of how the letter is written in cursive that we call it 'double u'.

In French, it is!