In the Chapter Manifestation of Rudra - Rudra Samhita Section one of Shiva Purana (Pg 224),
Brahma said this to his son Narada,
- A boar has the power of steadily going deep below. Hence, Vishnu ,the wanderer in the forest, assumed the form of Boar.
- Or Vishnu,the protector all the worlds assumed the form of a Boar, or start of a new Kalpa.
- Since the day he assumed the form a Boar, the aeon by the title of Varaha has started.
- Or the Varaha Kalpa can be considered to have started since the way we decided to assume the forms.
Similarly, in the Chapter Story of Rsbha - Shata Rudra Samhita of Shiva Purana (Pg 1078),
Lord Shiva said,
In the Seventh Varaha Kalpa, in the Vaivastara Manvantara , the Lord Kalpeswara who illuminates all the worlds, will be born as your great grandson and son of Vaivasvata Manu.
So there should be seven Varaha Avatars of Vishnu. I know two of them, one at time of creation and other at beginning of this Kalpa.
What are other five Varaha Avatars?