How may I fix my nametag GUI as the customization isn't being applied to the right user?

Hey so I'm new to scripting, very new.

I'm trying to make it so the nametag GUI will change depending on individual users. So for default users (as seen below) it will just show their name, but for individuals like myself and Peter_Ashford it will show specialized nametags custom to their role. However this script is having problems as lets say Peter and I were in a game, I would be given his title and he would be given some random citizens title and the random citizen might have my title. If someone could help me figure out as to why this is happening (also it's not giving anyone below peter a title)

game.Players.PlayerAdded:connect(function(Player)
    script.Parent.RankGui.Holder.PlayersName.Text = Player.Name

    if Player.Name == "Na_n" then
        script.Parent.RankGui.Holder.PlayersName.Text = "His Majesty".." "..Player.Name
    end
    if Player.Name == "Peter_Ashford" then
        script.Parent.RankGui.Holder.PlayersName.Text = "His Royal Highness".." "..Player.Name.." ".."KM"
    end
    if Player.Name == "Alexander_Ashford" then
        script.Parent.RankGui.Holder.PlayersName.Text = "His Royal Highness".." "..Player.Name
    end
    if Player.Name == "William_Houghton" then
        script.Parent.RankGui.Holder.PlayersName.Text = "His Royal Highness".." "..Player.Name
    end
    if Player.Name == "KeirYandem" then
        script.Parent.RankGUI.Holder.Playersname.Text = "The Rt. Hon.".." "..Player.Name.." ".."MR"
    end
    if Player.Name == "Griggi" then
        script.Parent.RankGUI.Holder.Playersname.Text = "The Rt. Hon.".." "..Player.Name.." ".."MR"
    end
    if Player.Name == "TimothyJWolfe" then
        script.Parent.RankGUI.Holder.Playersname.Text = "The Rt. Hon. Speaker".." "..Player.Name.." ".."MR"
    end
    if Player.Name == "TracticDev" then
        script.Parent.RankGUI.Holder.Playersname.Text = "The Hon.".." "..Player.Name.." ".."MR"
    end
    if Player.Name == "sanderdebouwer" then
        script.Parent.RankGUI.Holder.Playersname.Text = "The Hon.".." "..Player.Name.." ".."MR"
    end
    if Player.Name == "Benjamin_Paisley" then
        script.Parent.RankGUI.Holder.Playersname.Text = "The Rt. Hon.".." "..Player.Name.." ".."MR"
    end
end)