using System;

using System.Linq;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"

            {

              ""men"": [

                {

                  ""name"": ""Jordan"",

                  ""phone"": ""333-333-33""

                },

                {

                  ""name"": ""Timothey"",

                  ""phone"": ""444-444-44""

                }

              ],

              ""women"": [

                {

                  ""name"": ""Jennifer"",

                  ""phone"": ""111-111-11""

                },

                {

                  ""name"": ""Sasha"",

                  ""phone"": ""222-222-22""

                }

              ]

            }";

        JObject jsonDoc = JObject.Parse(json);

        var jsonProps = jsonDoc.Descendants().Where(t => t.Type == JTokenType.Property && ((JProperty)t).Name == "name");

        var startsWithJ = jsonProps.Where(t => ((JProperty)t).Value.ToString().StartsWith("J"));

        foreach (JProperty nameProp in startsWithJ)

        {

            Console.WriteLine(nameProp.Value);

            Console.WriteLine(((JProperty)nameProp.Parent.Parent.Parent).Name);

        }

    }

}