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The meaning of the name is: The One & Only
Al-Wahid, the One and Only God, protects you, the individual that you are, against the group, a number of individuals, whereas the latter cannot protect you against Him. Al-Wahid cannot be counted. He Alone is the source of all knowledge, the Only One Who reveals what is hidden. His existence has neither a duration nor a limit, nor can anyone carry out a decision against Him, nor can His Essence ever suffer any decrease or increase whatever.
وَإِلَٰهُكُمْ إِلَٰهٌ وَاحِدٌ ۖ لَا إِلَٰهَ إِلَّا هُوَ الرَّحْمَٰنُ الرَّحِيمُ Your god is the One God; there is no god except Him, the All-beneficent, the All-merciful. Al-Baqara : 163 قُلْ هُوَ اللَّهُ أَحَدٌ Say, ‘He is Allah, the One. Al-Ikhlaas : 1