Vishnu didn't died as he is a god and gods don't die at all.
Vishnu Kant Shastri died in 2005.
Vishnu Ramkrishna Karkare died in 1974.
Vishnu Moreshwar Mahajani died in 1923.
Vasudev Vishnu Mirashi died in 1985.
Narahar Vishnu Gadgil died in 1966.
Swami Vishnu Tirtha died in 1969.
Yeshwant Vishnu Chandrachud died on 2008-07-14.
Vishnu Bhikaji Kolte died on 1998-04-09.
Vishnu Ganesh Pingle died on 1915-11-16.
Vishnu Digambar Paluskar died on 1931-08-21.
Vishnu Narayan Bhatkhande died on September 19, 1936 at the age of 76.
Vishnu Sharanam means the total surrender to Vishnu the deity worshipped by the devotee IF you mean Vishnu Sahasranama, it means the One thousand names of Vishnu recited by devotees