Are The Letters Before Each Surah Are Surah's Name?
While nothing can be said with certainty regarding huruf-e-muqattat, Imam Farahi was of the opinion that they are names of the surahs. For answers to your questions, please refer to the article and the audio note by Hassan Ilyas sahab in the following discussion. Also the videos by Ghamidi sahab in the same discussion will be helpful: Discussion 1760