// Prints name of the font that customStyles[0] is using

function OnGUI() {
if(GUI.skin.customStyles.Length > 0)
Debug.Log("Font name: " + GUI.skin.customStyles[0].font.name);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void OnGUI() {
if (GUI.skin.customStyles.Length > 0)
Debug.Log("Font name: " + GUI.skin.customStyles[0].font.name);

}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def OnGUI():
if GUI.skin.customStyles.Length > 0:
Debug.Log(('Font name: ' + GUI.skin.customStyles[0].font.name))