The Bharata Agni was the son of Prajapati Bharata Agni. O best of the Bharata race, because he was greatly honoured, therefore he was called “great".
भरतो भरतस्याग्नेः पावकस्तु प्रजापतेः। महानत्यर्थमहितस्तथा भरतसप्तम॥