I think I understand what you're asking so I'll give you my general understanding of LB brackets. Let's say 200,000 people play CS in total. When an LB comes around, s8 randomly pulls players and puts them into groups of 20 (but sometimes less) to form a bracket; that's the list of names you see - your bracket. So for this example, there would be a total of 10,000 different brackets each containing 20 random players.
Sometimes you'll have neighbors or names you recognize and sometimes not but during the event, a player can only see the other 19 players in their own bracket. If I have a neighbor that is not in my bracket, their list will contain 20 different players than mine and so on and so forth. No one is really sure how they group us so far as we know it's totally random. I have heard of players seeing the same names in their brackets more than once but so far I've always had different players to my knowledge. I hope I explained that in a way you can understand. The downside of internet communication is the difficulty we sometimes face when trying to describe things with words only.