Namesakes
Fictional Characters from Television:
4 characters
Marissa Clark 1996 Early Edition 
Marissa Cooper 2003 The O.C.
Marissa Benson 2007 iCarly
Marissa Gold 2009; 2017 The Good Wife; The Good Fight
Notable Actors and Entertainers:
1 actor
Leighton Meester (a.k.a. Marissa) 1986-