From the Jain historical/gotra material available, I do not find any reliable Jain source that clearly states:

• that a person named Luna (as ādipuruṣ of Lunawat/Lunavat gotra)
• was the progeny of “Samra and Nara Bhandari”, and
• was a ruler of Nadol.

What we do see in Jain and Oswal traditions is:

1. Luna / Lunavat is a known Oswal–Jain gotra (connected with the older Upakeśa / Upkesh tradition). ( jainqq.org)
2. There are popular stories of Luna Shah and of Luna / Lunia families among Oswals, but these are about rich nagar‑seths or prominent householders, not about kings of Nadol. ( oswals.net)
3. The rulers of Nadol known from inscriptions are mainly Chāhamāna (Chauhan) kings such as Lakshmana, Alhanadeva, Kelhanadeva, etc., not a Luna or Lunawat ancestor. ( en.wikipedia.org)

Because of this, from a Jain‑historical point of view:

• The specific claim that “Luna ādipuruṣ of Lunawats, progeny of Samra and Nara Bhandari, was ruler of Nadol” cannot be confirmed from authentic Jain or inscriptional sources.
• It is best treated as a family or local vanshāvalī belief, not as an established historical fact of Jain history.

For a general overview on Lunawat as a Jain community surname, you can also see this brief note on JainKnowledge: “Who are Lunawat”