By major, I mean Vedas and related Shruti, Upanishads, the two epics, and Mahapuranas.
Vishvakshena is mentioned in some Puranas aa given below:
- The goddess of fortune, Sri, who never leaves the Lord’s side, appears with Him in this world as the representation of His internal potency. Visvaksena, the chief among His personal associates, is known to be the personification of the Pancaratra and other tantras. And the Lord’s eight doorkeepers, headed by Nanda, are His mystic perfections, beginning with anima.
Then having worshipped the deities, beauty, growth and Garuda, he should worship the guardian deities of the different quarters of the heaven and the god Brahma, above, and the god Ananta, below. After that, the god Vishvaksena should be worshipped at the north-east angle of the Mandalam.
He manifesting His Śuddha Sattva and super-extraordinary powers, and united with Aṇimā, Laghimā, etc., the eight Siddhis, is reigning there surrounded by His Pāriśadas Viṣvaksena and others. He is the one God of all; He is without a second. For the welfare of all, He is holding Sudarśana and His various other weapons; and the powers of His arms are great.
Yes, Vishvaksena is mentioned as one of the names of Vishnu in the Mahabharata Vishnu sahasra nAma (1000 names of Vishnu)
sarvagah sarva vid bhAnur vishwakseno janArdhanaH | vedo vedavidhavyango vedAngo vedavith kaviH ||
Edit: According to Sri Shankara, Vishnu is called Vishvaksena because he routs the armies of the daityas on all sides.
Translation: 123 सर्वगः sarvagah All-pervading 124 सर्वविद्भानुः sarvavid-bhaanuh All-knowing and effulgent 125 विष्वक्सेनः vishvaksenah He against whom no army can stand 126 जनार्दनः janaardanah He who gives joy to good people 127 वेदः vedah He who is the Vedas 128 वेदविद् vedavid The knower of the Vedas 129 अव्यंगः avyangah Without imperfections 130 वेदांगः vedaangah He whose limbs are the Vedas 131 वेदविद् vedavit He who contemplates upon the Vedas 132 कविः kavih The seer