Ibn Alaa says that once his father wrote a letter to the Prophet (peace be upon him), and at the beginning, he wrote his own name first (as this is also the Sunnah).
Hadith Referenceمسند احمد / تتمہ مُسْنَدِ الْكُوفِيِّينَ / 18986
Hadith Gradingحکم دارالسلام:إسناده ضعيف لجهالة ابن العلاء بن الحضرمي، وابن سيرين لم يقم إسناده