The name Surya Namaskar is from Sanskrit Surya is the Hindu god of the sun. This identifies the Sun as the soul and source of all life. Chandra Namaskar is similarly from Sanskrit 
 
The origins of Surya Namaskar are vague; Indian tradition connects the 17th century saint Samarth Ramdas with Surya Namaskar exercises, without defining what movements were involved. In the 1920s, Bhavana Rao Srinivasa Rao Pant Pratinidhi, the Rajah of Aundh, popularized and named the practice, describing it in his 1928 book The Ten-Point Way to Health: Surya Namaskars. It has been asserted that Pant Pratinidhi invented it, but Pant stated that it was already a commonplace Marathi tradition.

Ancient but simpler Sun salutations such as Aditya Hridayam, described in the “YuddhaKaanda” Canto 107 of the Ramayana, are not related to the modern sequence. The anthropologist Joseph Alter states that Surya Namaskar was not recorded in any Haṭha yoga text before the 19th century. At that time, Surya Namaskar was not considered to be yoga, and its postures were not considered asanas; the pioneer of yoga as exercise, Yogendra, wrote criticising the “indiscriminate” mixing of sun salutation with yoga as the “ill-informed” were doing.
 
The yoga scholar-practitioner Norman Sjoman suggested that Krishnamacharya, “the father of modern yoga”, used the traditional and “very old” Indian wrestlers’ exercises called dands, described in the 1896 Vyayama Dipika, as the basis for the sequence and for his transitioning vinyasas. Different dands closely resemble the Surya Namaskar asanas Tadasana, Padahastasana, CaturangaDandasana, and Bhujangasana. Krishnamacharya was aware of Surya Namaskar, since regular classes were held in the hall adjacent to his Yogasala in the Rajah of Mysore’s palace. His students, K. PattabhiJois, who created modern day Ashtanga Vinyasa Yoga, and B. K. S. Iyengar, who created Iyengar Yoga, both learnt Surya Namaskar and flowing vinyasa movements between asanas from Krishnamacharya and used them in their styles of yoga.
 
The historian of modern yoga Elliott Goldberg writes that Vishnudevananda’s 1960 book The Complete Illustrated Book of Yoga “proclaimed in print” a “new utilitarian conception of Surya Namaskar” which his guru Sivananda had originally promoted as a health cure through sunlight. Goldberg notes that Vishnudevananda modelled the positions of Surya Namaskar for photographs in the book, and that he recognised the sequence “for what it mainly is: not treatment for a host of diseases but fitness exercise.