Mr Balaji I am putting Wat is written in Wikipedia about Tamil sivan means red. Means one who has red skin. Who is very fair in skin tone. Only fair skin can get red in anger. But in Vedic books he is dark in colour and also called neelkanth. Copying what I found in wikki Main article: List of titles and names of Shiva<quoted text>
Ms Shruthi the Rigveda, the oldest of the Vedas, was composed roughly between 1700 and 1100 BCE,(you can google it) but the ancient tamil sangam existed approximately 7000 to 5000BC(you can also google it)there are numerous literatures in tamil which explains about the sangam age........
Do you know that the tamil word sivan was sanskritised as shiva
"Sivan" literally means "the red one"
As sivan is an angry god he aquires that name ,as the red(sivapu in tamil)colour symboloises anger
The Sanskrit word Shiva (Devanagari: िश 57;, śiva) comes from Shri Rudram Chamakam of Taittiriya Samhita (TS 4.5, 4.7) of Krishna Yajurveda. The root word śi  means auspicious. In simple English transliteration it is written either as Shiva or Siva. The adjective śiva, is used as an attributive epithet not particularly of Rudra, but of several other Vedic deities.
The other popular names associated with Shiva are Mahadev, Mahesh, Maheshwar, Shankar, Shambhu, Rudra, Har, Trilochan, Devendra (meaning Chief of the Gods) and Trilokinath (meaning Lord of the three realms).
The Sanskrit word śaiva means "relating to the god Shiva", and this term is the Sanskrit name both for one of the principal sects of Hinduism and for a member of that sect. It is used as an adjective to characterize certain beliefs and practices, such as Shaivism. He is the oldest worshipped Lord of India.
The Tamil word Sivan, Tamil: வ 1121; ("Fair Skinned") could have been derived from the word sivappu. The word 'sivappu' means "red" in Tamil language but while addressing a person's skin texture in Tamil the word 'Sivappu' is used for being Fair Skinned.
Adi Sankara, in his interpretation of the name Shiva, the 27th and 600th name of Vishnu sahasranama, the thousand names of Vishnu interprets Shiva to have multiple meanings: "The Pure One", or "the One who is not affected by three Gunas of Prakrti (Sattva, Rajas, and Tamas)" or "the One who purifies everyone by the very utterance of His name."  Swami Chinmayananda, in his translation of Vishnu sahasranama, further elaborates on that verse: Shiva means "the One who is eternally pure" or "the One who can never have any contamination of the imperfection of Rajas and Tamas".
Shiva's role as the primary deity of Shaivism is reflected in his epithets Mahādeva ("Great God"; mahā "Great" and deva "god"), Maheśvara ("Great Lord"; mahā "great" and īśvara "lord"), and Parameśvara ("Supreme Lord").
There are at least eight different versions of the Shiva Sahasranama, devotional hymns (stotras) listing many names of Shiva.
The version appearing in Book 13 (Anuśāsanapa rvan) of the Mahabharata is considered the kernel of this tradition.
Shiva also has Dasha-Sahasranamas (10,000 names) that are found in the Mahanyasa. The Shri Rudram Chamakam, also known as the Śatarudriya, is a devotional hymn to Shiva hailing him by many names.
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