How do i remove the parent spritesheet name in all sliced sprites?

So yeah, i have this issue right now where i have a ton of spritesheets for items. Like every single spritesheet is it's own item. and it's like this *spritesheetname*_*sprite*.

However i want to remove the *spritesheetname* so it's only *sprite*.

so i tried to make this script :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class FixSprites : MonoBehaviour {
 
     public string Part;
 
     // Use this for initialization
     void Start () {
         var subSprites = Resources.LoadAll<Sprite> ("Textures/"+Part+"/");
         foreach (Sprite item in subSprites) {
             string input = item.ToString ();
             string output = input.Substring (input.IndexOf ('_') + 1);
             item.name = output;
             Debug.Log (item.name);
         }
     }
     // Update is called once per frame
     void Update () {
     }
 }

However it doesn't save them. Is there any other way i can tackle this issue? Thanks,