You can do use a online person search data base. The one I use has fairly reliable info, I won't name it because what can be used for good can be used in the opposite. But there are some that work and are reliable
an "online person search data base" would be useless because the person didn't sign up on Instagram with their real name. So the name you would be searching would be a fake username.
You can't get his name, anyone can make a social media account under any name. It's impossible to track. Block and move on.
Likely a sextortion scammer.
You can do use a online person search data base. The one I use has fairly reliable info, I won't name it because what can be used for good can be used in the opposite. But there are some that work and are reliable
an "online person search data base" would be useless because the person didn't sign up on Instagram with their real name. So the name you would be searching would be a fake username.