1) Indian family name 
Viswanathan is an Indian surname and given name. It is of Hindu origin and derives from višvanatha, meaning `lord of the universe` (from višva, `universe` + natha, `lord,` an epithet of the god Shiva), + the Tamil-Malayalam third-person masculine singular suffix -n. Although used as a given name in India, it has also come to be used as a f...