Who was the first man in Hindu mythology?

According to the Matsya Purana, sage Manu was the first man (and the first human) created by God. In the above Purana it was mentioned that Lord Brahma created, using his divine powers, the Goddess Shatrupa (as Saraswati was first called) and out of the union of Brahma and Shatrupa was born Manu. Manu obtained through long penance his wife Ananti. The rest of the human race originated from Manu and Ananti. Details about the children of Manu and Ananti are found in the Bhagavata Purana. Manu is also considered to be the author of the ancient Sanskrit code of law, Manu Smriti, which was the summary of a discourse given by Manu to several rishis. The English noun man and the sanskrit verb mun, meaning to think, are supposed to have evolved from the word Manu. Rigveda has a different account of the origin of the human race, which was born from the five children (four male, and one female) of Lord Prajapati, as Brahma was earlier called. Of the two versions, the Matsya Purana is more popular and complete.