Guild Wars 2

I have a friend at workplace who play this game, he told me his server, toon name, and his log in name except that 4 stupid numbers (you know, those numbers)

Is there any easier way i can look for him?

You know how MOBA game or Warcraft 3 Ladder, they have this database where you can look up certain player

Does anyone know any official or fansite of guild wars 2 player database that i can do that?

PS: when i want to invite someone (to party or guild) do i use his login name or character name?

You can invite with character names.

There is no player database yet that I know of.

You can invite with either character name or login name.
You can add either name to your friends list and you’ll see when they login.