I regularly get reminders for dental visits in Oklahoma, purchase orders for machinery in Germany, and course registrations for some person who works in my industry and was easily searchable online.
It is not so intrusive to be problematic, and is mildly interesting.
I had it when someone (or likely his partner) with the same (somewhat uncommon!) firstname.lastname@gmail.com used my email. I started digging and it turned out we both were/are PhD students, just totally different fields. Must have something to do with the name. I was happy that via the faculty site I found his "real" email. Nearly send him a really weird post card, I had only his postal address...
In the other case I must have simply experimented with first initial/middle initial/last name, and that worked.
One is a minister in the Boston area, so it's not hard to recognize her inbound emails.