Metoda statyczna zwraca zawsze tę samą wartość

class Patient
    {

        public Patient(int age, string name, string surname)
        {
            Age = age;
            Name = name;
            Surname = surname;

        }

        public string Name { get; set; }
        public string Surname { get; set; }
        public int Age { get; set; }
    }

static void Main(string[] args)
        {
            
            List<Patient> PatientList = new List<Patient>();
            Random rnd = new Random();

            for (int i = 0; i < 25; i++)
            {
                PatientList.Add(new Patient(rnd.Next(13,81), Generator.CreateName(), Generator.CreateSurname() ));
            }      
        }

CreateName()

 zwracały różne wartości?

 public static string CreateName()
        {
            string[] NameList = new string[20];

            NameList[0] = "Jan";
            NameList[1] = "Paweł";
            NameList[2] = "Mateusz";
            NameList[3] = "Piotr";
            NameList[4] = "Kamil";
            NameList[5] = "Łukasz";
            NameList[6] = "Dawid";
            NameList[7] = "Maciej";
            NameList[8] = "Marek";
            NameList[9] = "Karol";
            NameList[10] = "Romuald";
            NameList[11] = "Wiktor";
            NameList[12] = "Tobiasz";
            NameList[13] = "Stefan";
            NameList[14] = "Andrzej";
            NameList[15] = "Jarosław";
            NameList[16] = "Adam";
            NameList[17] = "Antoni";
            NameList[18] = "Michał";
            NameList[19] = "Przemysław";

            Random rnd = new Random();

            return NameList[rnd.Next(NameList.Length)];
		}

	public static string CreateSurname()
        {

            string[] FirstSyllable = new string[20];

            FirstSyllable[0] = "No";
            FirstSyllable[1] = "Ka";
            FirstSyllable[2] = "Le";
            FirstSyllable[3] = "Dąb";
            FirstSyllable[4] = "Kra";
            FirstSyllable[5] = "Hry";
            FirstSyllable[6] = "Ma";
            FirstSyllable[7] = "Bo";
            FirstSyllable[8] = "Wiś";

            string[] MiddleSyllable = new string[20];

            MiddleSyllable[0] = "wal";
            MiddleSyllable[1] = "niew";
            MiddleSyllable[2] = "wan";
            MiddleSyllable[3] = "dow";
            MiddleSyllable[4] = "zur";
            MiddleSyllable[5] = "niewie";
            MiddleSyllable[6] = "brąw";
            MiddleSyllable[7] = "rzań";

            string[] LastSyllable = new string[20];

            LastSyllable[0] = "ski";
            LastSyllable[1] = "cki";
            LastSyllable[2] = "wak";
            LastSyllable[3] = "ak";
            LastSyllable[4] = "ik";
            LastSyllable[5] = "ur";

            string surname = null;

            Random rnd = new Random();
            Random toBe = new Random();

            surname += FirstSyllable[rnd.Next(10)];

            if (toBe.Next(2) == 1)
            {
                surname += MiddleSyllable[rnd.Next(8)];
            }

            surname += LastSyllable[rnd.Next(7)];

            return surname;

		}

Random rnd = new Random();