Finding the First People On Social Media

I had a thought today. I have a friend on Instagram who has a handle @theirname1. I was wondering who got the handle without the number at the end. I was thinking, they cannot be that old since Instagram itself is not that old. And why stop there...why not look at the people who old the handles for the most common names? Like who owns @bob? Or @john or @mary? Do famous or rich people ever buy those handles or are they owned just by early adopters?