The son of Cakṣu known as Cākṣuṣa was the sixth Manu. He had many sons, headed by Pūru, Pūruṣa and Sudyumna.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
षष्ठश्च चक्षुषः पुत्रश्चाक्षुषो नाम वै मनुः । पूरुपूरुषसुद्युम्नप्रमुखाश्चाक्षुषात्मजाः
ṣaṣṭhaśca cakṣuṣaḥ putraścākṣuṣo nāma vai manuḥ | pūrupūruṣasudyumnapramukhāścākṣuṣātmajāḥ
SB 8.5.7