The story of the origin of Shukla Yajur Veda is associated with Sage Yajnavalkya. Once Sage Yajnavalkya, a disciple of Sage Jaimini had a serious argument with his guru. The matter of argument was related to King Janak.
Both the Guru and his disciple were not ready to give up. They had heated arguments. Guru was angry at the behavior of his disciple.
The infuriated Guru, Jaimini, ordered his disciple to abdicate all the knowledge that he had imparted.
Immediately, Yajnavalkya obeyed it and vomited all the knowledge that had gained from his guru.
Yajnavalkya left the ashram and performed intense Tapas. He prayed to the Sun (Surya) and assumed him as his guru.
Surya was pleased to have such a worthy disciple and Surya imparted him all the knowledge.
All that Surya taught Yajnavalkya emerged as Shukla Yajur Veda.
Since then, the scholars of Shukla Yajur Veda are called Yajnavalkyas.
In the Shukla Yajur Veda imparted by Surya Bhagavan, the worship of Sun and the worship of Sri Sudarshan are prominent.