I also have @gmail.com because I got my account before April 1st, 2004 (the public release date).
My name is also uncommon but it's very English, so I get weird email from England, Scotland, Ireland, Canada, South Africa, Australia, and New Zealand—anywhere there was an Anglo diaspora. I've given up trying to do anything about it, and it really isn't a problem because the volume is very low.
I have tried sending emails, contacting them few times but to no good result.
As someone who's had this same Gmail address for 18 years, I'm here to tell you it is absolutely a pointless waste of your time and almost never results in the sender changing their address book, workflow, or typing skills.