It is called that because it begins with Surat Al-Naba, which begins with the word “uncle”. It contains 37 surahs, which are from the short surahs, and the main focus of these surahs and of the part in general is that the Hereafter is to God Almighty, and oh man, be connected to your Lord, obedient to God Almighty, because the whole matter is in the hands of God. It comes in short, touching and thin surahs.