I understand what has happened, but in the future try to take better care of your online presence. To remain anonymous, it's essential to create a completely different username each time you signup to a website. That way, it becomes much harder to track you across the web. In addition to that, some people also use VPN to mask their IP. Some also use different or anonymous email addresses.
For damage control, I'd advise you to delete accounts that can be deleted. If you prefer create a new one but using the above mentioned safety practices.
It's too late, he put his name and his username in his public CV, in github licenses, in his scientific publications . It took 1 minute of googling to find his real name. It's delusional to expect he can get that genie back in the bottle.
There's nothing wrong with having your username and real name tied together, unless you don't want certain information or views (i.e political affiliations, sexual preferences, etc) which is broadcasted under your online persona to be associated with your real life person. The problem is that the OP didn't do the due diligence to create a different persona to voice subjects they did not want associated with them IRL.
Like I said, I understand the damage has been done, but to prevent future instances (and possibly mitigate existing ones) the OP will have to take certain measures which may involve sacrificing information published under their current online persona (by deleting accounts, changing usernames etc). It should make things a little harder for online sleuths, but nevertheless not impossible to track down.
I can provide another suggestion, which is to change their real name. Depends on the OP, how far they are willing to go to undo their mistake.
I understand what has happened, but in the future try to take better care of your online presence. To remain anonymous, it's essential to create a completely different username each time you signup to a website. That way, it becomes much harder to track you across the web. In addition to that, some people also use VPN to mask their IP. Some also use different or anonymous email addresses.
For damage control, I'd advise you to delete accounts that can be deleted. If you prefer create a new one but using the above mentioned safety practices.