アバター内に含まれている重複したGameObject名を修正するやつ

AvatarBoneNameFixer.cs

using System.Collections.Generic;
using System.Linq;
using UnityEditor;
using UnityEngine;

namespace TORISOUP.Editor.AvatarBoneNameFixer
{
    public class AvatarBoneNameFixer : EditorWindow
    {
        [MenuItem("GameObject/AvatarBoneNameFixer", false, 0)]
        public static void Process()
        {
            var o = Selection.gameObjects.FirstOrDefault();
            if (o == null) return;

            var clone = Clone(o);
            
            var boneNameCount = new Dictionary<string, int>();

            RecursiveTransformSearch(boneNameCount, clone.transform);
        }

        private static void RecursiveTransformSearch(IDictionary<string, int> dic, Transform t)
        {
            if(dic.ContainsKey(t.name))
            {
                var origin = t.name;
                // すでにある
                t.name = $"{origin}_{dic[t.name]}"; 
                dic[origin]++;
            }
            else
            {
                // 初
                dic.Add(t.name, 1);
            }

            if (t.childCount == 0) return;
            foreach (Transform i in t)
            {
                RecursiveTransformSearch(dic, i);
            }
        }

        private static GameObject Clone(GameObject oigin)
        {
            var clone = Instantiate(oigin);
            var parent = oigin.transform.parent;
            clone.transform.SetParent(parent);
            clone.transform.localPosition = oigin.transform.localPosition;
            clone.transform.localRotation = oigin.transform.localRotation;
            clone.transform.localScale = oigin.transform.localScale;
            clone.transform.SetAsLastSibling();
            clone.name = oigin.name;
            clone.name = GameObjectUtility.GetUniqueNameForSibling(parent, clone.name);
            return clone;
        }
    }
}