Among the rites of Hajj is passing through Muzdalifah, standing there, and supplicating. What is the reason for its designation as ‘Muzdalifah’?

Muzdalifah is a site in Mecca situated between Mina and ‘Arafat. It has three names: Muzdalifah, Jam ‘(gathering), and Al-Mash‘ar al-Haram (the Sacred rite).

It was named “Muzdalifah” for several reasons:

• It is said that the name derives from the root zalafa, meaning ‘to draw near,’ referring to the pilgrims approaching Mina after their departure from ‘Arafat.
• It is also said that it refers to the pilgrims gathering there.
• Another view holds that it was so named because Adam and Eve (peace be upon them) reunited there after descending to earth. [1]

And Allah Almighty knows best.