Izme –Allah-Ahzam
The greatest name of Allah all exalted by the jewel among the
muqarrabin the example of those who have quench their thirst, the
unreachable falcon, the expander of islam, the master of tarbiyaat
the pole our beloved sheikh Umar Futiy may Allah bless us with one of
his glance.

In his book Ar Rimah al Hizb al Raheem page 365- chapter 30

The scholars have 21 opinions about the ism-ahzam (the greatest name
of Allah)
1-The first group says that only Allah the all exalted know the izm-
Ahzam
2-the second group says that the greatest name is Allah this is the
opinion of the ghouse Ahzam S. Abdul Qadir Jialni qadassallahu sirrahu
3-the third group says that the big name is Allahu rahmanu rahim
4-the fourth group say that the big name is in this following verse
wa ilaahu kum ilaahum waahidun lailahailla huwar rahmanu rahim surah
Baqarah verse 163
and the other from surah aali imran verse 3 Alif Laam Mim Allahu laa
ilaha illa huwal hayyul qayyum
5- the fifth group says that the big name Al hayyul qayyum because it
is the one found in Baqara, surah Ali imrann and Surah Taha reported
by (Imam nawawi)
6-the sixth group says that the biggest name is the following Al
hannanul mannanu badius samaawaati wal ardi zil jalaali wal ikram.
7-the seventh group says that the ism ahzam is Badiul samaawaati wal
ardi zil jalaali wal ikram
8-the eight group says that the greatest name is laa ilaaha ilaa
huwal ahadus samadul lazi lam yalid walam yuulad wa lam yakun lahu
kufwan ahad this was reported by ibn hajar and its riwaayah is strong
9- zul jalaali wal ikraam
10-Rab-rab
11-maalikul mulk
12-laa ilaaha illa anta subhaanaka inni kuntu minal zaalimin
13-laa ilaaha illalaah
14-Huwa- Allahu Allahu Allahu Allahu Alladzi laa ilaa illahuwa rabbul
archil azim
15-some opinions says that the ism ahzam is the 99 Allah's names.
16-the sixteen's group says that each name you take with full
confidence it is the biggest name. this according to Jahfar Saddiq
and Juneid.
17-he seventeeth group says that Allahoumma is the biggest name from
(imam zarqazi)
18- the eighteenth group say that alif laam miim is the ism ahzam
this is according to (Ouzeyzi)
19- Allahu hamiidu qahharu
20- the twentieth group says that kamalul miah is the 100 th name,
this name is not taken from any of the 99 names of Allah, but it's
meaning can be found inside it. It was reported (Dabback).
21 -------------------------------------------------------
In one hadiz Hadrat Annas may Allah be pleased of him said that he
heard the holy prophet may peace be upon him repoting: that he asked
Allah all exalted to give him the greatest name, Allah sent down
Jibril a.s. to give him the name, the name was wrapped and very well
close.
Also one day Aicha rda asked the holy prophet saw about the 100 th
name, the prophet saw replied that he is not allowed to give this
name to a woman a children and a fool.

It has been also reported by the isthm of the gnose the axe
pludimentional of the mohammadi sanctity the hidden seal our beloved
shaykh Ahmad tijani rda said that the holy prophet saw told him, that
there is a barrier between the 100th name and the people, this name
is only given to the Ahlul khussusiyyatu which are few, if the people
knew this name they would leave leave the holy quran, salaat and only
be devoted to this name because of the virtues of the name. the 100th
name of Allah is not for dunya and it's perishable luxuries, if one
among the knower of this name use it for dunyaa he will lose both
worlds dunyaa and aakirah( may Allah save us against that amen)