Xbox Gamertag Search [upd] Direct

Tap the Search icon (magnifying glass) and enter the gamertag. This is often the fastest way to search multiple names because you can use your phone’s keyboard.

If you are performing an to see if a name is free to claim, the official way is through the Xbox Change Gamertag portal. Xbox One - How To Search Gamertags xbox gamertag search

A: No. Searching for a Gamertag is anonymous. They will not know you looked them up unless you send them a message or a friend request. Tap the Search icon (magnifying glass) and enter

Select Find someone at the bottom of the list. xbox gamertag search