There are hundreds of noble Kovacs families. Siebmacher's Wappenbuch has illustrations of 45 coats of arms. If you can identify your family with some precision, perhaps I can find it for you. Do you know where the family lived, the name of the person ennobled, where the family originated from, date of ennoblement? Any of these would be helpful in narrowing the list down. I will help you if I can.