How to get the name of a player that clicked a brick?

I have this script in a brick:

local giver = 1

function onClicked()
    game.Players.[I NEED THE PLAYER NAME HERE].leaderstats.Clicks.Value = game.Players.[I NEED THE PLAYER NAME HERE].leaderstats.Clicks.Value + giver
end

script.Parent.ClickDetector.MouseClick:connect(onClicked)

Now I need to somehow get the player's name that clicked it and put it where I need to.

The ClickDetectors's MouseClick event have the "Clicking Player" as parameter, so you can do it like this:

local giver = 1

function onClicked(Player)
    Player.leaderstats.Clicks.Value = Player.leaderstats.Clicks.Value + giver
end

script.Parent.ClickDetector.MouseClick:connect(onClicked)

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However, this requires the FilteringEnabled to be set to false (not recomended).

To solve this, make a LocalScript in the brick with the code:

script.Parent.ClickDetector.MouseClick:connect(function(Player)
    game.ReplicatedStorage:WaitForChild("BrickClick"):InvokeServer(script.Parent)
end)

And in a Script placed in the ServerScriptService put:

local Listener = game.ReplicatedStorage:FindFirstChild("BrickClick")
if Listener == nil then
    Listener = Instance.new("RemoteFunction")
    Listener.Name = "BrickClick"
    Listener.Parent = game.ReplicatedStorage
end

function Listener.OnServerInvoke(Player,Brick)
    Player.leaderstats.Clicks.Value = Player.leaderstats.Clicks.Value + 1
end

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I won't point you to the wiki page for further reading, even thought it contains a bit of what you need, it contains too little information.

The ClickDetector's MouseClick info, the guide about FilteringEnabled and the guide about RemoteFunctions are better.