Harvard University named Nirmal P. “Narv” Narvekar to head its $35.7 billion endowment as the school struggles to get investment performance on track at the largest fund in higher education. Narvekar, 54, who has been the CEO of Columbia University’s $9.6 billion fund since 2002, will assume the role of president and chief executive officer at Harvard Management Co. on Dec. 5, Harvard said in a statement Thursday.