Shiva as a noun is a weeklong period of formal mourning for a close relative while Siva as a noun is the hindu god of destruction - part of the trinity of brahma, vishnu & siva. brahma is the creator, vishnu is the preserver & siva is the destroyer.
Part of speech: noun
Definition: a weeklong period of formal mourning for a close relative
Part of speech: proper noun
Definition: The Hindu God of Destruction - part of the trinity of Brahma, Vishnu & Siva. Brahma is the Creator, Vishnu is the Preserver & Siva is the Destroyer.
We hope you now know whether to use Shiva or Siva in your sentence.