Why did Allah call the prophets by their names, except for Prophet Muhammad, whom He did not call by his name?

The name "Muhammad" as a proper noun for the Prophet, peace and blessings be upon him, is mentioned four times in the Holy Quran. Three of these instances are coupled with his description as a Messenger (Aal Imran/144, Al-Ahzab/40, Al-Fath/29), and one instance is in reference to the revelation of the Quran to him (Muhammad/2).

The wisdom behind not addressing him by his bare name in the Quran, and sufficing with the address "O Prophet" (Ya Ayyuha An-Nabi) and "O Messenger" (Ya Ayyuha Ar-Rasool), lies in teaching the Ummah not to address him by his bare name, and in showing reverence and honor for his status, unlike other prophets who were addressed by their names. For Allah, the Exalted, addressed the prophets by their names, whereas He addressed the Prophet Muhammad, peace and blessings be upon him, with that which befits him of veneration.