Fatwa:

 All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad  is His slave and Messenger.

Different scholars  tried to determine the Names of Allah which are mentioned in the Quran and the Sunnah . For instance, Shaykh Ibn 'Uthaymeen  stated 99 names which he extracted from the Quran and the Sunnah , and they are as follows:

1- The Names of Allah which are mentioned in the Quran (81 Names):

- Allah, Al-Ahad, Al-A'la, Al-Akram, Al-Ilaah, Al-Awwal, Al-Aakhir, Ath-Thaahir, Al-Baatin, Al-Baari', Al-Barr, Al-Baseer, At-Tawwaab, Al-Jabbaar, Al-Haafith, Al-Haseeb, Al-Hafeeth, Al-Hafiyy, Al-Haqq, Al-Mubeen, Al-Hakeem, Al-Haleem, Al-Hameed, Al-Hayy, Al-Qayyoom, Al-Khabeer, Al-Khaaliq, Al-Khallaaq, Ar-Ra'oof, Ar-Rahmaan, Ar-Raheem, Ar-Razzaaq, Ar-Raqeeb, As-Salaam, As-Samee', Ash-Shaakir, Ash-Shakoor, Ash-Shaheed, As-Samad, Al-'Aalim, Al-'Azeez, Al-'Atheem, Al-'Afuw, Al-'Aleem, Al-'Aliyy, Al-Ghaffaar, Al-Ghafoor, Al-Ghaniyy, Al-Fattaah, Al-Qaadir, Al-Qaahir, Al-Quddoos, Al-Qadeer, Al-Qareeb, Al-Qawiyy, Al-Qahhaar, Al-Kabeer, Al-Kareem, Al-Lateef, Al-Mu'min, Al-Muta'aali, Al-Mutakabbir, Al-Mateen, Al-Mujeeb, Al-Majeed, Al-Muheet, Al-Musawwir, Al-Muqtadir, Al-Muqeet, Al-Malik, Al-Maleek, Al-Mawla, Al-Muhaymin, An-Naseer, Al-Waahid, Al-Waarith, Al-Waasi', Al-Wadood, Al-Wakeel, Al-Waliyy, Al-Wahhaab.

 2- The names of Allah which are mentioned in the Sunnah of the Prophet  (18 Names):

-Al-Jameel, Al-Jawaad, Al-Hakam, Al-Hayiyy, Ar-Rab, Ar-Rafeeq, As-Sabooh, As-Sayyid, Ash-Shaafi, At-Tayyib, Al-Qaabidh, Al-Baasit, Al-Muqadim, Al-Mu’akhkhir, Al-Muhsin, Al-Mu'ti, Al-Mannaan, Al-Witr.

 Finally, it should be mentioned that other scholars mentioned other Names, and that these Names are some of the Names of Allah and not all of them. The evidence for this is the saying of the Prophet : “O Allah! I ask You by every Name belonging to You, which You Named Yourself with, or Revealed in Your Book, or You Taught to any of Your Creation, or You have Preserved in the knowledge of the unseen with You,…” [Ahmad] Of course, no one can know the Names which Allah Preserved in the knowledge of the unseen.

Allah Knows best.

Fatwa answered by: The Fatwa Center at Islamweb