Dhul-Kifl is Prophet Ezekiel (Surah 21:85; 38:48)

 بِسۡمِ اللّٰہِ الرَّحۡمٰنِ الرَّحِیۡمِ

الصلاة والسلام عليك يا سيدى يا رسول الله

وعلى آلك واصحابك يا نبي الله

Allah عز وجل mentions a figure called Dhal-Kifl twice in the holy Quran (Surah 21:85; 38:48). Since he is listed with other Prophets, namely, Ishmael, Idris (who is usually identified as Elijah), and Elisha it is correct to assume that he too was one of the Prophets. He is usually identified with the Prophet Ezekiel. The strongest argument for this identification is the fact that Al-Kifl is the name of a town in southeastern Iraq containing the tomb of a Prophet which both Jews and Muslims identify as that of Ezekiel’s: “The traditional burial-place of the prophet Ezekiel, around which many sages and legends have gathered, is shown at Kefil near Birs Nimrud; for centuries it has been a favorite place of pilgrimage for Mohammedans as well as for Jews.” (Jewish Encyclopedia; v.5, p.316):

Among the mufassirin (commentators of the Quran) it is narrated that both Imam al-Hasan al-Basri and Muqatil bin Sulayman identified Dhul-Kifl with the prophet Hizqil (Ezekiel):

قَالَ الْحَسَنُ وَمُقَاتِلٌ هُوَ ذُو الْكِفْلِ وَسُمِّيَ ‌حِزْقِيلُ ‌ذَا ‌الْكِفْلِ

(Tafsir al-Baghawi; v.1, p.293):

According to my research, the Prophet Ezekiel is likewise the figure mentioned in Surah 2:259 which describes his famous Vision of the Valley of Dry Bones.