The 99 Names of Allah, (Arapça: أسماء الله الحسنى ʾasmāʾ allāh al-Ḥusnā), are the Names of God (specifically, attributes) by which Muslims regard God and which are traditionally maintained as described in the Qur'an, and Sunnah, amongst other places. There is, according to hadith, a special group of 99 names but no enumeration of them. Thus the exact list is not agreed upon, and the Names of God (as adjectives, word constructs, or otherwise) exceed 99 in the Qur'an and Sunnah. According to a hadith narrated by Abd Allah ibn Mas'ud some of the names of God have been hidden from mankind, therefore there are not only 99 names of God but there are more.
« Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: There are ninety-nine names of Allah; he who commits them to memory would get into Paradise. Verily, Allah is Odd (He is one, and it is an odd number) and He loves odd number. And in the narration of Ibn 'Umar (the words are): "He who enumerated them." »</div>
« They are traditionally enumerated as 99 in number to which is added as the highest Name (al-ism al-ʾaʿẓam), the Supreme Name of God, Allāh. The locus classicus for listing the Divine Names in the literature of qurʾānic commentary is 17:110, “Call upon God, or call upon The Merciful; whichsoever you call upon, to Him belong the most beautiful Names,” and also 59:22–24 q 59:22-4, which includes a cluster of more than a dozen Divine epithets.»</div>
Islamic theology makes a distinction between the Attributes of God and the Divine Essence.
The 99 names point to the inherent unity of the all-embracing Greatest Name. In Islamic traditions, it is stated "The Greatest Name of Allah is the one which if He [Allah] is called (prayed to) by it, He will Answer." (Ibn Majah).
Bahá'í sources state that the 100th name was revealed as "Bahá’" (an Arabic word بهاء meaning "glory, splendor" etc.), which is the root word for Bahá'u'lláh and Bahá'í. It is also known as the 'Greatest Name'. The Báb wrote a noted pentagram-shaped tablet with 360 derivatives of the word "Bahá'" used in it.
According to Islamic tradition, a Muslim may not be given any of the 99 names of Allah in exactly the same form. For example, nobody may be named al-Malik (The King), but may be named Malik (King). This is because of the belief that Allah is almighty, and no human being is the equivalent of Allah, and no human being will ever be the equivalent of Allah. Muslims are allowed to use the 99 names of Allah for themselves but should not put 'Al' at the front of them.
However the names/attributes of Allah can be combined with the word "‘Abd -" which means "servant/slave" (of Allah) and are commonly used as personal names among Muslims. For example ‘Abd ar-Raḥmān ("Servant of the Most Compassionate/the Beneficent"). The two parts of the name may be written separately (as above) or combined as one transliterated name; in such a case, the vowel transcribed after ‘Abd is often written as u when the two words are transcribed as one: e.g., Abdurrahman, Abdul'aziz, "Abdul Jabbar", or even Abdullah ("Servant of Allah"). (This has to do with Arabic case vowels, the final u vowel showing the normal "quote" nominative/vocative case form: ‘abd-u.)
Some Muslim people have names resembling those 99. Examples include
↑Mahmoud Abdul Razek Al Radwany, “Of the 99 Names Of Allah That We Repeat: Only 69 Are Authentic” published in the Egyptian daily, Al Ahram, in Nov 18, 2005. His objections are mostly grammatical in that a ‘name’ in Arabic must be a noun: “only 69 of those Names are authenticated from the Quran and Sunnah, while 29 are not authentic in that 22 are verbs or adjectives, and 7 are 'modafa' or ‘added to.’” Islamic Forum
↑ 5,05,1Böwering, Gerhard. "God and His Attributes". Encyclopaedia of the Qurʾān.