The 99 Names · From the Prophetic Sunnah
As-Sayyid السيد
The Master, who holds the forelocks of all creation and manages their affairs; all mastery belongs to Him.
Explanation
A detailed explanation of this name (in Arabic) is in: Sharh Asma' Allah al-Husna fi Daw' al-Kitab wa al-Sunnah — Dr. Sa'eed ibn 'Ali ibn Wahf al-Qahtani — p. 128 ↗
The author explains this name together with: As-Samad
Evidence
«السَّيِّدُ اللَّهُ تَبَارَكَ وَتَعَالَى»
Call upon Allah by this name
“To Allah belong the Beautiful Names, so call upon Him by them” — Al-A'raf 180
Example for practice
اللهم أنت السيد وأنا عبدك، فتولّ أمري ولا تكلني إلى غيرك
O Allah, You are the Master and I am Your servant; take charge of my affair and do not leave me to anyone else.
An example for practice, not a transmitted text — following the Quranic way of closing a request with the fitting name (see Ibn al-Qayyim, Bada'i' al-Fawa'id 2/249).