LayerMask.LayerToName

public static string LayerToName (int layer);

Description

Given a layer number, returns the name of the layer as defined in either a Builtin or a User Layer in the Tags and Layers manager.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Example() {
        Debug.Log(LayerMask.LayerToName(1));
    }
}