Using a reverse lookup service like Social Catfish, Spokeo, or PeopleFinders to find the person's Reddit profile is your best bet.

• Spokeo is another excellent people search tool. Spokeo compiles all publicly available information and saves it in a single database. It allows you to seek up information about anyone you want to hunt down online in a secure manner.
• Visit Spokeo.
• . Choose what information you have on the person, then type it into the search bar and press Enter.
• Spokeo then looks for people who have the same information as you. You can look through each profile page to see if the person you're looking for is listed there.

Read More: How do I find the email address of someone's Reddit account?