Accessing array/list of game object by name in hierarchy

Never depend on the order of items FindGameObjectsWithTag returns as this is not specified in the documentation and can be unpredictable. You have to add a custom function that loops through the array and finds your specified GameObject by comparing with the GameObject.name property.

GameObject[] players;
void test()
{
    players = GameObject.FindGameObjectsWithTag("Player");
    foreach (GameObject go in players)
    {
        Debug.Log("Player " + go + " is named " + go.name);
    }
}

GameObject getGameObject(string gameObjectName)
{
    for (int i = 0; i < players.Length; i++)
    {
        //Return GameObject if the name Matches
        if (players[i].name == gameObjectName)
        {
            return players[i];
        }
    }

    Debug.Log("No GameObject with the name \"" + gameObjectName + "\" found in the array");
    //No Match found, return null
    return null;
}

Usage:

GameObject card1 = getGameObject("card1");
GameObject card2 = getGameObject("card2");
GameObject card3 = getGameObject("card3");
GameObject card4 = getGameObject("card4");

EDIT:

If your goal is to sort the items in the array, in order, then this should do it:

players = GameObject.FindGameObjectsWithTag("Player");
players = players.OrderBy(c => c.name).ToArray();