Yes, but only if the user has a unique legacy gamertag (created before 2019). Most new tags require the full suffix for an exact match.
You remember playing with “ShadowKnight” but can’t find them? Here’s how to search properly. xbox usernames search
You may find websites claiming to offer “Xbox username search” or “gamertag lookup.” Be extremely cautious. Yes, but only if the user has a
Searching for existing players is a straightforward process whether you are on a console, mobile, or the web. or the web.