The Prophet ﷺ had a servant named Rabah.
قال حدثنا وكيع قال حدثنا عكرمة بن عمار
كان للنبي ﷺ غلام يسمى رباحا
No references are available.
Its chain of transmission is sahih. It is also found in Ibn Saad 1/2/180, mentioning the servants of the Messenger of Allah ﷺ.