Janardana (Sanskrit: जनार्दन IAST /janārdana/) is another name of Vishnu or God and appears as the 126th name in the Vishnu sahasranama. It is also a common name of Krishna being address as such by Arjuna in the Bhagavad Gita.
According to Adi Sankara' s commentary on the Vishnu sahasranama, translated by Swami Tapasyananda, Janardana means "One who inflicts suffering on evil men." Alternatively, it means, "He to whom all devotees pray for worldly success and liberation,".
References
Janardana Wikipedia(Text) CC BY-SA