First Muslim

Imam 'Ali (pbuh) was the first male to embrace Islam. Sharh Nahj al-Balaghah, ibn Abi al-Hadid al-Mu'tazili, 13:224
He himself declares: "I started worshipping Allah nine years before anyone else in this nation started worshipping Him except Prophet Muhammad (pbuh&hf)."Khasa'is Amir al-Mu'minim, al-Nisa'i, 13:39; refer also to Tarikh al-Tabari 2:316 and 5:17 to see when other companions embraced Islam