Is your email address something like [fullname]@gmail.com? Because in that case it's more likely that someone is either confused about their own email address or just made a typo and left out the number they put after the name they happen to share with you.
It is in the form of [fullname]@gmail.com. It got so bad to the point that I called the guy and we spoke. Now when I see an email from an org in his state, I automatically forward it to him. My email for instance is firstlast@gmail.com, his is firstllast@gmail.com and he forgets to put the 'l'.