According to a hadith, there are at least 99 Names of Allah, known as the Asma ul Husna (Arabic: أسماء الله الحسنى‎ Beautiful Names of Allah).

According to Sahih Bukhari Hadith (99 Names of Allah / Asma ul Husna / أسماء الله الحسنى )

Abu Hurairah reported that Allah has ninety-nine Names, i.e., one hundred minus one, and whoever believes in their meanings and acts accordingly, will enter Paradise; and Allah is witr (one) and loves 'the witr' (i.e., odd numbers).



Sahih Bukhari - Vol. 8, Book 75, Hadith 419 (99 Names of Allah / Asma ul Husna / أسماء الله الحسنى )

There's another Sahih Muslim Hadith about (99 Names of Allah / Asma ul Husna / أسماء الله الحسنى )
Allah's Messenger (ﷺ) said, "Allah has ninety-nine Names, one-hundred less one; and he who memorized them all by heart will enter Paradise." To count something means to know it by heart.


Sahih Bukhari - Vol. 9, Book 93, Hadith 489 (99 Names of Allah / Asma ul Husna / أسماء الله الحسنى )

The Quran refers to God's Most Beautiful Names (Asma ul Husna) in several Surahs. Gerhard Böwering refers to Surah 17 (17:110) as the locus classicus to which explicit lists of 99 names used to be attached in tafsir. A cluster of more than a dozen Divine epithets which are included in such lists is found in Surah 59. Mystic philosopher Ibn Arabi surmised that the 99 names are "outward signs of the universe's inner mysteries".


Hazrat Muhammad (PBUH) said there are 99 names of Allah / أسماء الله الحسنى and that anyone who memorizes all the names will be awarded paradise.