using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace ConsoleApplication1
{
classProgram
    {
staticvoid Main(string[] args)
        {
string Name = "Isenbaev";
ArrayList OF = newArrayList();
ArrayList NF = newArrayList();
int n = int.Parse(Console.ReadLine());
int[,] kol = newint[n, 3];
bool f = false;
string[,] name = newstring[n, 3];
for (int i = 0; i < n; i++)
            {
string[] s = Console.ReadLine().Split(' ');
for (int j = 0; j < 3; j++)
                {
                        f = true;
                        kol[i, j] = -1;
                        name[i, j] = s[j];

                }
            }
int t=1;
            OF.Add(Name);
while (OF.Count != 0)
            {
for (int z = 0; z < OF.Count; z++)
                {
                    r = false;
for (int i = 0; i < n; i++)
                    {
                        f = false;
for (int j = 0; j < 3; j++)
                        {
if ((OF[z].ToString().CompareTo(name[i, j]) == 0) && (kol[i, j] == -1))
                            {
                                kol[i, j] = t - 1;
                                f = true;
break;
                            }
                        }
if (f)
                        {
for (int j = 0; j < 3; j++)
                            {
if (OF[0].ToString().CompareTo(name[i, j]) != 0)
                                {
int d=0;

for (int y = 0; y < OF.Count; y++)
                                    {
if (name[i, j].CompareTo(OF[y].ToString()) == 0)
                                        {
                                            d++;
                                        }
                                    }
if (d == 0)
                                    {
                                        kol[i, j] = t;
                                    }
                                        NF.Add(name[i, j]);
}
                            }
                        }
                    }
                }
                OF.Clear();
for (int i = 0; i < NF.Count; i++)
{
                    OF.Add(NF[i]);
                }
                NF.Clear();
                t++;
            }
string[] res = newstring[n*3];
int k=0;
for (int i = 0; i < n; i++)
            {
for (int j = 0; j < 3; j++)
                {
if (kol[i, j] == -1)
                    {
                        res[k] = name[i, j] + " undefined";
                    }
else
                    {
                        res[k] = name[i, j] + " " + kol[i, j];
                    }
                        k++;
                }
            }
Array.Sort(res);
for (int i = 0; i < (n*3)-1; i++)
            {
if (res[i].CompareTo(res[i + 1]) != 0)
                {
Console.WriteLine(res[i]);
                }
            }
if ((res[n * 3 - 1]).CompareTo(res[n * 3 - 2]) != 0)
            {
Console.WriteLine(res[n*3-1]);
            }
        }
    }
}

Your program is not reading 3rd name.
use
Console.ReadLine().Split(new char[] { ' ', '\t', '\n', '\r' }, StringSplitOptions.RemoveEmptyEntries);
istead of
Console.ReadLine().Split(' ');