I think I understand the question...
If you're looking for old global friends, there is no way to look up old globals; that database is not available. All accounts now are brand new. Some people do not yet know the game is back, some have moved on and don't want to play, others are waiting on definitive stability, and some don't want to play i25 content and are on other private servers.
Your best bet is to go to one of the Old Shard threads (like the Virtue one, and post there to see if anyone recognises the old globals.
Otherwise, just using /getglobal or /findmember IIRC.
But if they have not created an account, you won't find them.