Some believe that al-Muntaqim (The One Who Avenges, The Inflictor of Retribution) is one of Allāh’s Names. This is incorrect:

Shaykh al-Islām Ibn Taymiyyah (d. 728), may Allāh have mercy upon him, said, “And the name al-Muntaqim is not from the beautiful names of Allāh established from the Prophet ﷺ. It only occurs in the Qurʾān in a restricted sense, such as His, the Most High’s statement, {We shall surely inflict retribution on the guilty} [al-Sajdah (32): 22], and His statement, {Allāh is indeed Exalted in Might and Owner of Retribution} [Ibrāhīm (14): 47]. The ḥadīth regarding the number of beautiful names, which contains the mention of al-Muntaqim, is not, according to the people of insight into ḥadīth, from the speech of the Prophet ﷺ.

See: Majmūʿ al-Fatāwá (8: 96).

Shaykh Ibn al-ʿUthaymīn (d. 1420), may Allāh have mercy upon him, said, “As for al-Muntaqim, it is not from the names of Allāh because Allāh the Exalted did not mention this description for Himself except in a restricted sense, and every description which comes in a restricted sense, is not from Allāh’s names, because Allāh’s names are absolutely perfect without the need for qualification. Allāh, the One far removed from every imperfection, and Exalted be He, only mentioned al-Muntaqim as a counter to crime, so He said, {We shall surely inflict retribution on the guilty} [al-Sajdah (32): 22], therefore, al-Muntaqim is not from the names of Allāh.”

See: Majmūʿ al-Fatāwá (1: 162, no. 72).