Ask HN: Google leaked my email through Google Maps

I just received a direct email, which ended up in the spam folder, using the name I assigned to my Google account. This name is unique, not used anywhere else, I only specified it because it appears on Google Maps reviews.

I believe my Google profile is as locked down as possible, but I can’t figure out how this person was able to link my public “Google account” name to my email.

Where did I mess up? The email itself is a simple “<Name> hello”