Or they could just have a similar gmail address they frequently get wrong (or that looks like yours when written in the terrible handwriting they fill in forms with)

There's probably a single digit number of people with my initial and surname in the world, and I still get order confirmations for one of them, car promotions for another and am on some sort of targeted B2B spam list for a third to my Gmail address in that format. I quite like the order confirmations tbf, most of them are for a fish and chip shop I actually used to get food at when I was a kid and my grandparents lived nearby so they're oddly nostalgic