The actual body of the sutra starts such: བཅོམ་ལྡན་འདས་་་་་་
བཅོམ་ལྡན་འདས། (bcom ldan 'das) is Bhavagan, a title given to Buddha, the Victorious One, the Blessed One, The Conqueror, the Victorious Conqueror and so on. There are many translation of this Sanskrit title. This title is common in Sutras and other texts, so it's good to remember.
You could see all the possible translations in the provided link to the dharmadictionary entry. But it's good to know that the root is really bhavagan.
PS: If you want to hear the Heart Sutra in Tibetan, here's an excellent link.