When, how and by whom was Hz. Umar given the nickname "Faruq"?

Dear Brother / Sister,

Hz. Umar was given the nickname "Faruq" by the Prophet (pbuh) when he became a Muslim

At-Taftazani states that Hz. Umar was given the nickname Faruq because he distinguished between the right and the wrong in his decrees and in legal cases. (Hashiyatul-Kastalli p.178)

This name indicates the truth, Islam, the true religion, that he regards the truth to be superior to everything, that he surrenders himself to the truth and that this characteristic of his is prominent. When he became a Muslim, he challenged Quraysh and the whole world without fearing and by risking anything. (Tarikhul-Islam, p. 172 ff.)

It is understood from this characteristic of Hz. Umar how much he supported the truth and how strongly he believed. It becomes salient that one of the reasons for his superiority is this characteristic. (The Messenger of Allah expressing Hz. Umar’s religiousness based on a dream Sahihul-Bukhari, IV, 201)

After becoming a Muslim, Hz. Umar started to feel restless and said to the Messenger of Allah, 

"O Messenger of Allah! Are we not in the true religion whether we die or live?"

The Messenger of Allah answered:

"Yes, I swear by Allah, in whose hand of power my existence is that you are in the true religion whether you die or live." Thereupon, he said,  

"Why do we hide then? I swear by Allah, who sent you with the true religion that I will go to all assemblies of polytheists and proclaim Islam bravely."

Thereupon, the Messenger of Allah left "Darul-Arqam" and started to walk toward the Kaaba followed by Hz. Umar on his right side, Hz. Hamza on his left side and the Companions behind them. They entered Masjid al-Haram with solemn steps.

The polytheists, who expected to see the head of the Messenger of Allah, were surprised by this scene. They were looking at Hz. Umar and Hz. Hamza in a surprised, timid and scared way. Then, they felt a bit brave and asked, 

"O Umar! What do you have behind you? What did you come with?"

Hz. Umar said, 

"I came with La ilaha illallah, Muhammadur-Rasulullah." Then, he added, "Let nobody move or I will behead him." 

The polytheists shut up. They looked as if they were dumb. The Messenger of Allah circumambulated the Kaaba freely and prayed. The Muslims prayed openly too.
Hz. Umar said,

"At that time, the Messenger of Allah gave me the nickname 'FARUQ' 'for distinguishing between right and wrong.'" (Ibn Sa'd, Tabaqat: 3/270)

Hz. Hamza's becoming a Muslim and then Hz. Umar’s becoming a Muslim enabled Islam to develop and the Muslims to worship easily by getting rid of the pressure of the polytheists. Therefore, Hz. Umar’s becoming a Muslim has an important place in the history of Islam. Abdullah bin Mas'ud expressed this importance as follows:

"Umar’s becoming a Muslim was a conquest for Islam and honor and dignity for the Muslims. His migration to Madinah became a victory and his caliphate became a mercy. We could not perform prayers openly in the yard of the Kaaba until Umar became a Muslim." (Ibn Sa'd, Tabaqat: 3/270; Suhayli, Rawdul-Unf: 1/219).

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