Load textures from external path, without change their names.

There is a coupple of solutions availaible to you if you want to load images dynamically whatever the name of the images are.

We have done this on many of our projects.

The easiest way would be to use something like this:

 using UnityEngine;
 using System.IO;
 using System.Collections.Generic;
 using System.Collections;
 
 public class MyClass : MonoBehaviour {
 
     public string _imageFolderPath = @"C:\My\Image\Path";
     List<Texture2D> _projectImages = new List<Texture2D>();
 
 
     IEnumerator BatchLoadImages()
     {
         if(Directory.Exists(_imageFolderPath))
         {
             // Make sure your list is empty your list
             _projectImages.Clear();
             //get path for all .jpg files in directory and subDirectories.
             string[] dirPaths = Directory.GetFiles(_imageFolderPath,"*.jpg" ,SearchOption.AllDirectories); 
             if(dirPaths.Length>0)
             {
                 //load each images
                 foreach (string path in dirPaths)
                 {
                     string url = "";
                     // look if the path is an url or a local path
                     if(path.Contains("http:"))
                     {
                         url = path;
                     }
                     else
                     {
                         url = "file://" + path;
                     }
                     // Create an empty texture
                     Texture2D newTexture = new Texture2D (512,512,TextureFormat.ARGB32,true);
                     // loads the image
                     WWW www = new WWW (url);
                     yield return www;
                     // Load it into a Texture2D
                     www.LoadImageIntoTexture (newTexture);
                     //add texture to the list.
                     _projectImages.Add(newTexture);
                 }
             }
         }
         else
         {
             Debug.LogWarning("The Image loading path does not exist");
         }
     }
 }
 

this would return an array of texture2D you could then use to suits your needs.

If you need something more robust with more infos that just an image path, you can use a data base that generates an XML file that will hold all the info you need about each images you want to load , parse it in Unity and use the data to load your images.

Hope it helps, tell me if you need more details