Unless I am mistaken, Google seems to be rolling out a new service called "Business email powered by G Suite." Based on the following links it looks like you can sign up for a business email address (meaning your own domain) from within your personal Gmail account, and the two will be linked. You don't necessarily have to activate other G Suite features. This might be a great way to have your own domain email without having to migrate email, contacts, data, etc. Not sure exactly how this works yet, or even if this is something new.
Business email powered by G Suite:
https://support.google.com/work/mail..._topic=6248365
How will my business email address work with my current email?
https://support.google.com/work/mail..._topic=6296469