Get name/variables from previously on server players

I'm new in Networking, i read alot of documentation but nothing seems to solve my problem.

I want to give a unique names (character name) for spawned player gameobject, it works for the players who connects after it, but the already on the server dont, same for its public variables.

There are any way to buffer at the server all players?

[SyncVar] public string pName;

[Command] void CmdNome(string nameIN) { RpcNome (nameIN); SetDirtyBit(1u); }

 [ClientRpc]
 void RpcNome(string nameIN)
 {
     pName = nameIN;
     this.name = nome;
 }

This is working like i said for players who log after "me".