One of the following is not part of the names of the Qu'ran.

"Ar-Rahman" is not a part of the names of the Qur'an. The Qur'an is the holy book of Islam, and it consists of 114 chapters, which are called "surahs" in Arabic. Each surah has a unique name, and these names are used to refer to the surahs when reading or studying the Qur'an. Out of the given options, "Al-Bayyinah," "An-Nur," and "Al-Huda" are names of surahs in the Qur'an, while "Ar-Rahman" is not. "Al-Bayyinah" means "the Clear Evidence," "An-Nur" means "the Light," and "Al-Huda" means "the Guidance." On the other hand, "Ar-Rahman" is one of the 99 names of Allah (God) in Islam, which means "the Most Merciful." Therefore, "Ar-Rahman" is not a part of the names of the Qur'an, while "Al-Bayyinah," "An-Nur," and "Al-Huda" are names of surahs in the Qur'an.