Bob Dylan is a household name, right?

I recently had a light argument (mostly just back-and-forth lol) with one of my friends in class last week about Sir Bobert Dylan. Me and my tablemate were discussing the new Bob biopic and my friend chimes in asking who Bob Dylan was. I genuinely thought he was joking as he plays guitar and listens to music of a similar genre and era. Then I got to asking my other friends in the class if they by chance knew Bob Dylan, and I was very surprised with the responses as a majority of them had never even heard of him. Is Bob Dylan not as well-known as I thought or was I just surrounded by his music a lot at home growing up?

TL;DR: A majority of friends I asked didn't know Bob, was he just big in the past or is he still popular?

Edit: For context I'm still in high school and no, I don't think I'm better for knowing him, I was simply curious on how many people knew his name/legacy.