The name Dhū'l-Kifl literally means "the one with a kifl", using a type of name where
 dhū ("possessor of") precedes some characteristically associated feature. Such names were used of other notable personalities in the Quran, e.g. Dhū'l-Nūn "the one with the fish", referring to the prophet Yūnus, and Dhū'l-Qarnayn "he of the two horns". 

       Kifl is an archaic Arabic word meaning "double" or "duplicate", from a root meaning 
"to double" or "to fold"; it was also used of a fold of cloth. The name is generally understood to mean "possessor of a double portion".

       The reason people believe that Ezekiel to be Dhul Kifl is because during the Exile of the Jews, monarchy and state were annihilated, and a political and national life was no longer possible.

        In the absence of a worldly foundation it became necessary to build upon a spiritual one. This mission Ezekiel performed by observing the signs of the time and by deducing his doctrines from them. In conformity with the two parts of his book his personality and his preaching are alike twofold, and the title Dhū'l-Kifl means "the one to double" or "to fold".

       In addition to this Baidawi said that it was used because Dhū'l-Kifl had to do double the work of other prophets.

Ezekiel 1:3. The word of the Lord came to Ezekiel the priest, the son of Buzi, in the land of the Chaldeans, by the Kevar river; and the hand of the Lord was there upon him.

Ezekiel 24:24 Thus shall Ezekiel be a sign to you; according to all that he has done shall you do; and when this comes, you shall know that I am the Lord God.

       Dhul-Kifl is mentioned in the following Quranic verses:

S21:85 And (remember) Ismail Idris and Zul-kifl all (men) of constancy and patience;

S38:48 And commemorate Ismail Elisha and Zul-Kifl: each of them was of the company of the Good.

       In both cases, Dhū'l-Kifl is mentioned in the context of a list of Quranic prophets, including many others not mentioned in the verses quoted above.

       Some Muslims, following the view of Muhammad ibn Jarir al-Tabari, hold that Dhul-Kifl was a righteous man who supported his people and administered true justice, but not a prophet.

        Baidawi asserted that Dhul-Kifl corresponds with the Jewish prophet Ezekiel, who was carried away to Babylon in chains and bore his duress patiently. A tomb said to be that of 
Dhul-Kifl can be seen in the town of Al Kifl, Iraq, near Najaf and Al Hillah. Others believed that he was a prophet.

       *** As usual, the Quran does NOT give any background to the Kifl character and hence the followers of Muhammad have to resort to CONVOLUTED logic and the deformation of history and the Bible to CREATE such a background ***