Dhul-Kifl
Yes. The name Dhul‑Kifl occurs in the Quran (for example in the list of righteous servants) and is thus a Quranic appellation.
Classical lexica render 'kifl' as a portion, share, a double portion, or an allocated recompense; scholars differ slightly on nuance, but it generally implies a measured portion or responsibility.
The Quranic text mentions Dhul‑Kifl among righteous figures; classical scholars differ on whether he was a prophet or a pious servant. There is no unanimous position identifying him definitively as a prophet.
While historically attested, Dhul‑Kifl is uncommon as a contemporary given name. When used, it is typically chosen for its direct Quranic reference and historical resonance.
Yes. Spellings vary in transliteration (Dhul‑Kifl, Dhu al‑Kifl, Zul‑Kifl) but they refer to the same Quranic appellation.