How to spawn a GameObject by name?

Hello! I am making an enemy spawner right now, and I want it to randomly select an enemy to spawn in a given amount of seconds. Here is my code, it is hard to explain without using the code.

 #pragma strict
 var spawnMin = 1;
 var spawnMax = 10;
 var enemyNum = 1;
 var NOE = 3;
 var spawnedEnemy = Transform;//I also tried a Game Object, it doesn't work
 var enemy = '';
 function Start () {
 InvokeRepeating("SpawnEnemy", 10, Random.Range(spawnMin, spawnMax));
 
 }
 
 function Update () {
 
 }
 
 function SpawnEnemy(ifnum : int){
 enemyNum = Random.Range(1,NOE);
 while(ifnum < NOE){
 enemy = ('enemy'+ (NOE - ifnum).ToString());//Each enemy is named enemy, then a number. Example: enemy1, enemy2
 
 if(enemyNum == NOE - ifnum){
 spawnedEnemy = Instantiate(GameObject.Find(enemy), transform.position, Quaternion.identity);//This is supposed to spawn the enemy which corresponds to enemyNum
 }
 else{
 ifnum += 1;
 }
 }
 }

I'm getting the error 'Cannot convert 'Unityengine.GameObject' to 'System.Type' (I can't copy and paste from the error window, so that's basically what the error is), so I think it has to do with the fact that I'm using GameObject.Find to spawn a certain enemy. I tried it with Transform.FindObjectsOfType, but that didn't work either. How can I get it to spawn