The tafsir sources indicate that the name of Allah in Surah Al-Fatihah, Ayah 4 is "Malik" (مَٰلِكِ), meaning "Sovereign" or "Owner."

Ibn Kathir explicitly states, "Allah is the True Owner (Malik) (of everything and everyone)" (Source 2). This is further supported by the hadith, "The most despicable name to Allah is a person who calls himself the king of kings, while there are no owners except Allah" (Source 3), emphasizing Allah's unique and absolute ownership.

Linguistically, the Arabic term is "Malik" (مَٰلِكِ), which is the active participle of the verb "malaka" (مَلَكَ), meaning "to own" or "to possess." This signifies an active and continuous state of ownership and sovereignty. While "Al-Malik" (الْمَلِك) is also one of Allah's Beautiful Names (Source 5), referring to "The King," the specific form used in 1:4 is "Malik" (مَٰلِكِ). Both terms convey Allah's supreme authority, but "Malik" in this context highlights His specific ownership over the Day of Recompense.

The emphasis on "Yawm Ad-Din" (Day of Recompense) highlights that on this Day, "no one except Him will be able to claim ownership of anything whatsoever" (Source 1). This is corroborated by Quranic verses like 40:16, "Whose is the kingdom this Day? Allah's, the One, the Irresistible" (Source 3). This absolute sovereignty on the Day of Judgment is a central theme in the interpretation.

📚 Sources: Classical tafsir (multi-source)