Namesakes
Fictional Characters from Television:
1 character
Mercedes Jones 2009 Glee 
Notable Actors and Entertainers:
3 actors
Mercedes McCambridge 1916-2004
Mercedes Ruehl 1948-
Mercedes McNab 1980-
Notable Musicians:
1 singer
Mercedes Sosa 1935-2009
Notable Writers:
1 author
Mercedes Lackey 1950-
Oscar Award Winners:
2 actresses
(actress) Mercedes McCambridge 1950 All the King's Men
(actress) Mercedes Ruehl 1992 The Fisher King
Saints:
2 blessed
Blessed Mercedes de Jesús Molina 1828-1883
Blessed Mercè Prat i Prat (a.k.a. Mercedes) 1880-1936