That's going to be a tough one. Beautiful people are popular on the internet. It's just a fact. There's probably quite a bit of anchor text links containing that last name, pointing at pictures of the glamour model. There's probably also a large volume of searches looking for that glamour model, compared to a fairly small number of searches looking for your CEO.
My advice is to make it a joke, and become part of the joke. Do your idea of a website with a URL containing the CEOs name, and optimize it for the CEOs name, etc. On the site, post a pic of the glamour model. Post some copy that says something like "Apparently, I share my last name with a glamour model. I don't actually look like that. If you were looking for the glamour model pictured on the right, and not a CEO with X years of experience in the X industry, click on the picture. If you want to learn more about X CEO and my insights into the X industry, click here for my blog."