Hari

 
Hari or Har(i) (Sanskrit: हरि, IAST: "Hari") is a name for the supreme absolute in the Vedas. Hari is also the one who removes darkness and illusion. Hari refers to God who takes away all the sorrows of his devotees. In the "Rigveda’s" Purusha Suktam (Praise of the supreme cosmic Being), Hari is the first and most important name of the supreme Divine Being (whose Sanskrit cognate is Brahman), second and alternative name of the supreme Being is Narayana according to Narayana Suktam of the"Yajurveda". Within the Hindu tradition, it is often used interchangeably with Vishnu to such an extent that they are considered to be one and the same. In the Vedas, it is required to use the mantra "Harih om" before any recitation, just to declare that every ritual we perform is an offering to that supreme Divine Being; even if the hymn praises some one or the other demigods. The idea of demigods as found in Hinduism is very different from that found within Greco-Roman mythology. This has to be borne in mind while understanding how, within Hinduism, all beings including demigods are inseparable from Hari. The phrase "Harih Om" gestures towards Advaita Vedanta and other categories of non-dual thinking. "Harih Om" is akin to saying that all creation that we can see is in fact, a mirroring of the One Self. This is not the concept of mimesis as found in Western philosophy. 
Hari in "Purusha Suktam", Narayana Suktam and Rudra Suktam is usually depicted as having a form with countless heads, limbs and arms (a way of saying that the Supreme Being is everywhere and cannot be limited by conditional aspects of time and space). Lord Hari is also called sharangapani as he also wields a bow named as sharanga.
The word "Hari" is widely used in Sanskrit and Prakrit literature as well as in Hindu, Sikhism, Buddhist and Jain religions. The name "Hari" also appears as the 656th name of Vishnu in the Vishnu sahasranama of the Mahabharata and is considered to be of great significance in Vaishnavism.
Etymology.
The Sanskrit word "हरि" (Hari) is derived from the Proto-Indo-European root "*"ǵʰel-" to shine; to flourish; green; yellow" which also gave rise to the Persian terms "zar" 'gold', Greek "khloros" 'green', Slavic "zelen" 'green' and "zolto" 'gold', as well as the English words "yellow" and "gold".
The same root occurs in other Sanskrit words like "haridrā", 'turmeric', named for its yellow color.
Other names of Hari.
There are multiple names of Lord Hari mentioned in the holy scriptures of Hinduism such as the Bhagavad Gita and Mahabharata. A few names which are used quite frequently,