Gandharva

 https://www.google.com/search?q=Kumar+Gandharva

Parshuram

 https://www.google.com/search?q=Parshuram+Devacharya

Harivyasa

 https://www.google.com/search?q=Harivyasa

bhatta

 https://www.google.com/search?q=Sribhatta

Radhashtakam

 https://www.google.com/search?q=Radhashtakam

Nivritti

Their knowledge comes to them of itself (without being dependent on study or exertion). These seven are wedded to the religion of Nivritti. They are the foremost of all persons conversant with Yoga. They are possessed also of deep knowledge of the Sankhya philosophy. They are preceptors of the scriptures on duty and it is they that introduce the duties of the religion of Nivritti and cause them to flow in the worlds.

https://www.google.com/search?q=Nivritti

Brahman

The puissant Lord who is charged with the creation of all the worlds is called Aniruddha, Sana, Sanatsujata, Sanaka, Sanandana, Sanatkumara, Kapila, and Sanatana numbering the seventh,--these seven Rishis are known as the spiritual sons of Brahman. 

https://freeglobaluniversity.blogspot.com/search/label/Brahman