A C# helper class for generating random first names and random last names.

NameGenerator.cs

using System;

namespace Helpers
{
    /// <summary>
    /// Name Generator.
    /// </summary>
    public static class NameGenerator
    {
        // List of the top 40 boy and girl baby names of 2016
        private static readonly string[] FirstNames = { "Liam", "Noah", "Ethan", "Lucas", "Mason", "Oliver", "Aiden", "Elijah", "Benjamin", "James", "Logan", "Jacob", "Jackson", "Michael", "Alexander", "Carter", "Owen", "Daniel", "William", "Luke", "Jack", "Gabriel", "Matthew", "Henry", "Sebastian", "Wyatt", "Nathan", "Isaac", "Grayson", "Ryan", "Caleb", "Levi", "Jayden", "Jaxon", "Eli", "David", "Dylan", "Andrew", "Julian", "Samuel", "Emma", "Olivia", "Ava", "Sophia", "Isabella", "Mia", "Charlotte", "Harper", "Amelia", "Emily", "Abigail", "Madison", "Ella", "Lily", "Avery", "Evelyn", "Sofia", "Aria", "Chloe", "Riley", "Ellie", "Scarlett", "Elizabeth", "Aubrey", "Layla", "Addison", "Grace", "Zoey", "Hannah", "Mila", "Zoe", "Victoria", "Brooklyn", "Lucy", "Penelope", "Natalie", "Nora", "Audrey", "Skylar", "Claire" };

        // List of the most common 80 USA last names
        private static readonly string[] LastNames = { "Smith", "Johnson", "Williams", "Brown", "Jones", "Miller", "Davis", "Garcia", "Rodriguez", "Wilson", "Martinez", "Anderson", "Taylor", "Thomas", "Hernandez", "Moore", "Martin", "Jackson", "Thompson", "White", "Lopez", "Lee", "Gonzalez", "Harris", "Clark", "Lewis", "Robinson", "Walker", "Perez", "Hall", "Young", "Allen", "Sanchez", "Wright", "King", "Scott", "Green", "Baker", "Adams", "Nelson", "Hill", "Ramirez", "Campbell", "Mitchell", "Roberts", "Carter", "Phillips", "Evans", "Turner", "Torres", "Parker", "Collins", "Edwards", "Stewart", "Flores", "Morris", "Nguyen", "Murphy", "Rivera", "Cook", "Rogers", "Morgan", "Peterson", "Cooper", "Reed", "Bailey", "Bell", "Gomez", "Kelly", "Howard", "Ward", "Cox", "Diaz", "Richardson", "Wood", "Watson", "Brooks", "Bennett", "Gray", "James" };

        /// <summary>
        /// Generates a random first name.
        /// </summary>
        /// <returns>First name.</returns>
        public static string GenerateFirstName()
        {
            return GetRandomArrayEntry(FirstNames);
        }

        /// <summary>
        /// Generates a random last name.
        /// </summary>
        /// <returns>Last name.</returns>
        public static string GenerateLastName()
        {
            return GetRandomArrayEntry(LastNames);
        }

        /// <summary>
        /// Gets a random array entry.
        /// </summary>
        /// <typeparam name="T">Array type.</typeparam>
        /// <param name="array">Array of type T.</param>
        /// <returns>Array entry.</returns>
        private static T GetRandomArrayEntry<T>(T[] array)
        {
            return array[new Random(Guid.NewGuid().GetHashCode()).Next(0, array.Length)];
        }
    }
}