Kephal in Greek means "head".
I always refer to Bible if found Qur'an mention person name.
For Dzul Kifli, I think nowhere on the Bible.
Kephale which mentioned on Greek version of Bible is greek word for Head as you mention, but no refer to any special person.
Btw, I am from Indonesia, in Bahasa the english word of Head is also Kepala, it is from Hindu Sanskrit because before Islam Indonesia religion is Hindu.
And it is interesting argument to be discussed that the Greek Mythology and Monotheist Religion was come from Hindu.
I will show some findings from "The Bible in India" book by Louis Jacolliot that many Greek Mythology similar with Hindu
Hercules. — In Sanscrit, Hara-kala hero of battles— an epithet commonly given to Siva, God of battles and of Hindoo poetry.
Theseus. — In Sanscrit, Tha-saha, the associate, companion of Siva.
AEacus. — A Judge in Hell, in Greek mythology; in Sanscrit, Aha-ka a severe judge, adjective of qualification, ordinarily attached to the name of Yama — the Hindoo Judge of Hell.
Ariadne. — The unhappy princess abandoned by Theseus, and who had committed the fault of giving herself up to the enemy of her family. ln Sanscrit, Ari-ana— seduced by an enemy.
RhaDamanthus. — Another Judgein Hell, in mythology; in Sanscrit,Radha-manta — who chastises crime.
Andromeda. — Sacrificed to Neptune, and succored by Perseus. In Sanscrit, Andha-ra-medha — sacrificed to the passion of the Water God.
Persius. — In Sanscrit, Para-saha— timely succor,
Centaur - Mythologic, half man, half horse. In Sanscrit, Ken-tiira -Man-horse.
and many more you can find in the book.
Also Abraham and Sarah (his wife) similar with Brahma and Saras-vati (Brahma wife).
I see that Qur'an talks only about events (and people living) in Middle East and Egypt.
Agree, but to be more specific Ayat Makkiyyah (Makkah revelation) talk about Egypt (Mishr), Syria/Lebanon, and Petra/Nabataean Kingdom
Hijaz (recently Makkah) and Yaman never mention. Btw, I still find facts about Sheeba which mention in Makkah Revelation, probably it is not in Yaman, but if actually in Yaman maybe because it is related with Solomon (Jerusalem).
Petra is mentioned as er-Raqeem in surah Kehf. Jordanians removed inscription Raqeem at the entrance of Petra some 50 years ago.
I have already had few books about Petra, this year plan to go there but God give me Liposarcoma cancer, so I postpone until my health back.