The given name Hadi has its origins in the Arabic language and culture, with its earliest use dating back to the 7th century CE. The name is derived from the Arabic word "hadi," which means "guide" or "one who leads to the right path."

In Islamic tradition, Hadi is considered one of the names of Allah, referring to His attribute as the guide and leader of humanity towards the straight path. The name holds significant religious and spiritual significance in the Islamic faith.

One of the earliest recorded instances of the name Hadi can be found in the Quran, the holy book of Islam. In Surah Al-Furqan (Chapter 25, Verse 31), the word "Hadi" is mentioned, referring to Allah as the guide and leader.

Throughout history, several notable figures have borne the name Hadi. One of the earliest was Hadi ibn Yahya al-Bukhari (779-868 CE), a prominent Islamic scholar and hadith collector from Bukhara, present-day Uzbekistan.

Another famous bearer of the name was Hadi ibn Mansur al-Hallaj (858-922 CE), a Persian mystic, philosopher, and poet known for his controversial teachings on divine union with God. He was executed for alleged heresy and became a prominent figure in Sufism.

In the 10th century, Hadi ibn Ibrahim al-Muqtadir (915-932 CE) was the Abbasid caliph who ruled from Baghdad, present-day Iraq, for a brief period.

During the 13th century, Hadi ibn Ahmad al-Saqqaf (1212-1292 CE) was a renowned Shafi'i scholar and jurist from Yemen, known for his extensive works on Islamic jurisprudence.

More recently, Hadi Seyed Soltan (1905-1984) was an Iranian military officer and politician who served as the Prime Minister of Iran from 1961 to 1962.

These are just a few examples of notable figures throughout history who have borne the name Hadi, reflecting its deep-rooted cultural and religious significance in the Arabic and Islamic traditions.