'Hari' means ‘the remover’. When one remembers His name and then repeats it, sins, karmas and bad astrological effects are steadily erased. Pain and suffering are removed.
Hari is one of the names of God in Sikhism. The Golden Temple, the most sacred temple in Sikhism, is also called Harimandir or "Temple of God." According to Sikhism, God is only formless and Sikhs do not believe "Harish" has any connection with Krishna/Vishnu.
In the Gaudiya Vaishnava tradition, Hari is a name of both Krishna or Vishnu meaning "he who steals, or takes away", referring to how Krishna takes away all distress and anxieties, and lovingly robs the heart of His devotee.
According to Adi Sankara's commentary on the Vishnu sahasranama, Hari means "One who destroys samsara", which is the entanglement in the cycle of birth and death, along with ignorance, its cause.
In the Ravidasi religion it is the holy symbol consisting of the three Gurmukhi letters with the character for "i" being made into a flame. It adorns all Ravidasi temples, known as Gurdehras. In Ravidassia Dharam it is used as "हरि" "ਹਰਿ".