RESTful API controller/route issue

With VS 2013 I created a simple MVC/Web Api app. It has Photo model:

public class Photo
{
    public int Id{ get; set; }
    public string Name{ get; set; }
    public DateTime DateTimeOriginal { get; set; }
}

and a PhotoController:

Photo[] photos = new Photo[] 
    { 
        new Photo { Id= 1, Name= "Mary B.",  DateTimeOriginal = Convert.ToDateTime("May 18, 2015 2:01:22 PM")}, 
        new Photo { Id = 2, Name= "Martin M.",  DateTimeOriginal = Convert.ToDateTime("May 18, 2015 2:13:09 PM" )}, 
        new Photo { Id = 3, Name= "Sparky",  DateTimeOriginal = Convert.ToDateTime("May 18, 2015 2:31:22 PM")} 
    };


    public IEnumerable<Photo> GetAllPhotos()
    {
        return photos;
    }

    public IHttpActionResult GetPhoto(int id)
    {
        var photo = photos.FirstOrDefault((p) => p.Id == id);
        if (photo == null)
        {
            return NotFound();
        }
        return Ok(photo);
    }
     public IHttpActionResult GetPhoto(string Name)
    {
        var photo = photos.FirstOrDefault((p) => p.Name== Name);
        if (photo == null)
        {
            return NotFound();
        }
   //I added this to see if this helps with the routing. It didn't
    public IHttpActionResult GetName(string Name)
    {
        var photo = photos.FirstOrDefault((p) => p.Name== Name);
        if (photo == null)
        {
            return NotFound();
        }
        return Ok(photo);

   }

This compiles and I can issue a web request like this:

http://localhost:59628/api/photos

And I'll get back an array of photo elements.

I can issue a web request like this:

http://localhost:59628/api/photos/2

And I'll get back element where ID =2

But

http://localhost:59628/api/photos/"Mary B" or Name="Mary B" or /GET/Name/Mary B or /api/photos/name/Mary B it returns an error.

SO my first question is why? How can I query the service for photos by name?

Second question: I see the information in the route config but even when I add this to the PhotosController:

     [Route("photos/{photo}/Name")]
     [HttpGet]
     public IHttpActionResult GetName(string Name)
     {
         var photo = photos.FirstOrDefault((p) => p.Name== Name);
         if (photo == null)
         {
             return NotFound();
         }
         return Ok(photo);
     }

I get back a 404. WHY?