How can i give another name/number to the created Plane object name ?

First my goal is when i click the Create button on the Create Plane window it will add to the Hierarchy a new Plane with a number for example if i have already in the Hierarchy: Plane and Plane (1) so when i click the Create button it will add to the Hierarchy Plane (2) and if i will click Create again then Plane (3).

And if i have for example Plane , Plane , Plane, Plane (1) then first change them all to: Plane, Plane (1) , Plane(2), Plane (3) then add the new one Plane (4).

In the regular situation if i make in the menu GameObject > 3d Object > Plane It will add first time object name Plane then next time Plane (1) then Plane (2) then Plane (3) and so on.

But i made a script and put the script in the hard disk in the directories: C:\Users\Me\Documents\Unity Projects\The Spaceship Quest\Assets\Editor

I called the script file name: CreatePlane.cs Now in the unity editor menu i can click on: GameObject > Create Other > Custom Plane... When i select Custom Plane... i have a small window i can change some parameters and then i click on the Create button.

And it's adding to the Hierarchy another new Plane and it's name is Plane. I can add this way many Planes and each one name is Plane not Plane (1) Plane (2)....Just Plane.

You can see in the screenshot i have in the Hierarchy: Plane and Plane (1) those from the original unity menu: GameObject > 3D Object > Plane

And i also have in the bottom: Plane Plane Plane this 3 planes are from the GameObject > Create Other > Custom Plane...

So first how can i make that when i create the Custom Plane... it will give it also name with numbers like (1) and (2) according to if Plane/s objects already exists in the Hierarchy ?

The problem is in my script there are static Onwizard functions and in each one when i add my code to number the Planes it's creating two Planes each time and not only one.

Screenshot:

The script:

 using UnityEngine;
 using UnityEditor;
 using System.Collections;
  
  
 public class CreatePlane : ScriptableWizard
 {
  
     public enum Orientation
     {
         Horizontal,
         Vertical
     }
  
     public enum AnchorPoint
     {
         TopLeft,
         TopHalf,
         TopRight,
         RightHalf,
         BottomRight,
         BottomHalf,
         BottomLeft,
         LeftHalf,
         Center
     }
  
     public int widthSegments = 1;
     public int lengthSegments = 1;
     public float width = 1.0f;
     public float length = 1.0f;
     public Orientation orientation = Orientation.Horizontal;
     public AnchorPoint anchor = AnchorPoint.Center;
     public bool addCollider = false;
     public bool createAtOrigin = true;
     public bool twoSided = false;
     public string optionalName;
  
     static Camera cam;
     static Camera lastUsedCam;
  
  
     [MenuItem("GameObject/Create Other/Custom Plane...")]
     static void CreateWizard()
     {
         cam = Camera.current;
         // Hack because camera.current doesn't return editor camera if scene view doesn't have focus
         if (!cam)
             cam = lastUsedCam;
         else
             lastUsedCam = cam;
         ScriptableWizard.DisplayWizard("Create Plane",typeof(CreatePlane));
     }
  
  
     void OnWizardUpdate()
     {
         widthSegments = Mathf.Clamp(widthSegments, 1, 254);
         lengthSegments = Mathf.Clamp(lengthSegments, 1, 254);
     }
  
  
     void OnWizardCreate()
     {
         GameObject plane = new GameObject();
  
         if (!string.IsNullOrEmpty(optionalName))
             plane.name = optionalName;
         else
             plane.name = "Plane";
  
         if (!createAtOrigin && cam)
             plane.transform.position = cam.transform.position + cam.transform.forward*5.0f;
         else
             plane.transform.position = Vector3.zero;
  
         Vector2 anchorOffset;
         string anchorId;
         switch (anchor)
         {
         case AnchorPoint.TopLeft:
             anchorOffset = new Vector2(-width/2.0f,length/2.0f);
             anchorId = "TL";
             break;
         case AnchorPoint.TopHalf:
             anchorOffset = new Vector2(0.0f,length/2.0f);
             anchorId = "TH";
             break;
         case AnchorPoint.TopRight:
             anchorOffset = new Vector2(width/2.0f,length/2.0f);
             anchorId = "TR";
             break;
         case AnchorPoint.RightHalf:
             anchorOffset = new Vector2(width/2.0f,0.0f);
             anchorId = "RH";
             break;
         case AnchorPoint.BottomRight:
             anchorOffset = new Vector2(width/2.0f,-length/2.0f);
             anchorId = "BR";
             break;
         case AnchorPoint.BottomHalf:
             anchorOffset = new Vector2(0.0f,-length/2.0f);
             anchorId = "BH";
             break;
         case AnchorPoint.BottomLeft:
             anchorOffset = new Vector2(-width/2.0f,-length/2.0f);
             anchorId = "BL";
             break;          
         case AnchorPoint.LeftHalf:
             anchorOffset = new Vector2(-width/2.0f,0.0f);
             anchorId = "LH";
             break;          
         case AnchorPoint.Center:
         default:
             anchorOffset = Vector2.zero;
             anchorId = "C";
             break;
         }
  
         MeshFilter meshFilter = (MeshFilter)plane.AddComponent(typeof(MeshFilter));
         plane.AddComponent(typeof(MeshRenderer));
  
         string planeAssetName = plane.name + widthSegments + "x" + lengthSegments + "W" + width + "L" + length + (orientation == Orientation.Horizontal? "H" : "V") + anchorId + ".asset";
         Mesh m = (Mesh)AssetDatabase.LoadAssetAtPath("Assets/Editor/" + planeAssetName,typeof(Mesh));
  
         if (m == null)
         {
             m = new Mesh();
             m.name = plane.name;
  
             int hCount2 = widthSegments+1;
             int vCount2 = lengthSegments+1;
             int numTriangles = widthSegments * lengthSegments * 6;
             if (twoSided) {
                 numTriangles *= 2;
             }
             int numVertices = hCount2 * vCount2;
  
             Vector3[] vertices = new Vector3[numVertices];
             Vector2[] uvs = new Vector2[numVertices];
             int[] triangles = new int[numTriangles];
             Vector4[] tangents = new Vector4[numVertices];
             Vector4 tangent = new Vector4(1f, 0f, 0f, -1f);
  
             int index = 0;
             float uvFactorX = 1.0f/widthSegments;
             float uvFactorY = 1.0f/lengthSegments;
             float scaleX = width/widthSegments;
             float scaleY = length/lengthSegments;
             for (float y = 0.0f; y < vCount2; y++)
             {
                 for (float x = 0.0f; x < hCount2; x++)
                 {
                     if (orientation == Orientation.Horizontal)
                     {
                         vertices[index] = new Vector3(x*scaleX - width/2f - anchorOffset.x, 0.0f, y*scaleY - length/2f - anchorOffset.y);
                     }
                     else
                     {
                         vertices[index] = new Vector3(x*scaleX - width/2f - anchorOffset.x, y*scaleY - length/2f - anchorOffset.y, 0.0f);
                     }
                     tangents[index] = tangent;
                     uvs[index++] = new Vector2(x*uvFactorX, y*uvFactorY);
                 }
             }
  
             index = 0;
             for (int y = 0; y < lengthSegments; y++)
             {
                 for (int x = 0; x < widthSegments; x++)
                 {
                     triangles[index]   = (y     * hCount2) + x;
                     triangles[index+1] = ((y+1) * hCount2) + x;
                     triangles[index+2] = (y     * hCount2) + x + 1;
  
                     triangles[index+3] = ((y+1) * hCount2) + x;
                     triangles[index+4] = ((y+1) * hCount2) + x + 1;
                     triangles[index+5] = (y     * hCount2) + x + 1;
                     index += 6;
                 }
                 if (twoSided) {
                     // Same tri vertices with order reversed, so normals point in the opposite direction
                     for (int x = 0; x < widthSegments; x++)
                     {
                         triangles[index]   = (y     * hCount2) + x;
                         triangles[index+1] = (y     * hCount2) + x + 1;
                         triangles[index+2] = ((y+1) * hCount2) + x;
  
                         triangles[index+3] = ((y+1) * hCount2) + x;
                         triangles[index+4] = (y     * hCount2) + x + 1;
                         triangles[index+5] = ((y+1) * hCount2) + x + 1;
                         index += 6;
                     }
                 }
             }
  
             m.vertices = vertices;
             m.uv = uvs;
             m.triangles = triangles;
             m.tangents = tangents;
             m.RecalculateNormals();
  
             AssetDatabase.CreateAsset(m, "Assets/Editor/" + planeAssetName);
             AssetDatabase.SaveAssets();
         }
  
         meshFilter.sharedMesh = m;
         m.RecalculateBounds();
  
         if (addCollider)
             plane.AddComponent(typeof(BoxCollider));
  
         Selection.activeObject = plane;
     }
 }

This is the code i'm trying to use with the script to number each new created Plane:

 static void DoSomething()
     {
         int cnt = (from g in UnityEngine.Object.FindObjectsOfType<GameObject>() where g.name.StartsWith("Plane") select g).Count();
         cnt += 1;
         newName = "Plane (" + cnt.ToString() + ")";
     }

newName is a static global string variable.

And i'm calling this DoSomething from inside the CreateWizard:

 static void CreateWizard()
     {
         cam = Camera.current;
         // Hack because camera.current doesn't return editor camera if scene view doesn't have focus
         if (!cam)
             cam = lastUsedCam;
         else
             lastUsedCam = cam;
         ScriptableWizard.DisplayWizard("Create Plane",typeof(CreatePlane));
 
         DoSomething();
     }

And changed the line:

 plane.name = "Plane";

To

 plane.name = newName; 

But then it's adding to the Hierarchy Plane (3) and also Plane (4) and it should add only new Plane (3) not that it's adding two Planes the first one is without the MeshFilter and the MeshRenderer. So i can't figure out why is that.

I tried also to create a new function called it: void OnWizardStart() and inside to put the code but it's never get to the OnWizardStart so it will create empty name Plane object.