Abu Hayyan al-Gharnati

Abū Ḥayyān Athīr ad-Dīn al-Gharnāṭī (Arabic: أَبُو حَيَّان أَثِير ٱلدِّين ٱلْغَرْنَاطِيّ, November 1256 – July 1344 CE / 654 - 745 AH), whose full name is Muḥammad ibn Yūsuf bin ‘Alī ibn Yūsuf ibn Hayyān (Arabic: مُحَمَّد ٱبْن يُوسُف ٱبْن عَلِيّ ٱبْن يُوسُف ٱبْن حَيَّان), sometimes called Ibn Hayyan, was a celebrated commentator on the Quran and foremost Arabic grammarian of his era. His magnum opus Tafsir al-Bahr al-Muhit (Explanation of the Ocean) is the most important reference on Qur'anic expressions and the issues of grammar, vocabulary, etymology and the transcriber-copyists of the Qur'an. Quite exceptionally for a linguist of Arabic of his day was his strong interest in non-Arabic languages. He wrote several works of comparative linguistics for Arabic speakers, and gives extensive comparative grammatical analysis and explanation.