using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var t = new []{ new { Name = "Rasmus" }, new { Name = "Rasmus" }, new { Name = "Bobsum" }, new { Name = "Rasmus" } };

        var s = t.GroupBy(p => p.Name).SelectMany(g => g.Select((n, i) => i == 0 ? n.Name : n.Name + " (" + i + ")"));

        foreach (var b in s) {

            Console.WriteLine(b);

        }

    }

}