The Prophet صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَم is Recorded as Having said “I Have Many Names…”

I have many names, I am Muḥammad, I am Ahmad, I am al-Māḥī (The Eraser) by whom Allah erases blasphemy, I am al-Ḥāshir (the Gatherer) behind whom people will be assembled, and I am al-ʿĀqib (the last of all prophets)(after whom there would be none), and Allah has named him as compassionate and merciful.
[Bukhari]

Slavery or Servitude of Allah Taʿālā is an attribute of esteem. It is one of the most beloved titles in the sight of Allah and Allah Taʿālā has used it in the Noble Qurʾān to refer to The Prophet صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَم  in numerous verses.
For instance when relating the incident of the Isrāʾ (the Prophet’s صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَم  miraculous night-journey to Jerusalem before his ascension to the heavens) the Qurʾān says:

Glory be to Him, who carried His servant by night from the Holy Mosque to the Further Mosque the precincts of which We have blessed, that We might show him some of Our signs.
[Sūra al-Isrāʾ 1]

The attribute of being a slave of Allah makes clear the distinction between the status of the Creator and the created. The attribute of being Sustainer (Rabb) and Divine (Ilāh) is solely that of Allah Taʿālā. The Prophet صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَم , despite
his lofty and elevated rank, possesses the attribute of slavery to the Divine Sustainer.

Nevertheless, at times Allah Taʿālā grants to some of his slaves the ability to demonstrate extraordinary feats like bringing the dead to life, curing the blind etc. but the distinction between the slave and the master must be always clearly maintained. The Christians fell into error by blurring this distinction
when they raised the Prophet ʿĪsā (Jesus) عليه السلام  to the rank of divinity after witnessing such marvelous events at his hands. The author chose to use the attribute of ‘slave’ for The Prophet صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَم  to emphasize this distinction.

The Prophet صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَم said:
لا تطروني كما أطرت النَّصارَى ابن مريم ، إنما أنا عبدٌ ، فقولوا عبد الله ورسوله
Do not exaggerate my praise as the Christians did for Jesus, son of Mary. I am but a slave. So call me the slave of Allah and His Messenger.
[Bukhārī]

The Qurʾān states:
Muhammad (صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَم )  is not the father of any of your men, but (he is) the Messenger of Allah, and the Seal of the Prophets.