Namesakes
Characters in Greek Mythology:
1 character
Cassandra (a.k.a. Alexandra) (f) 
Fictional Characters from Plays and Musicals:
1 character
Alexandra Giddens 1939 The Little Foxes
Fictional Characters from Television:
1 character
Lexie Carver (a.k.a. Alexandra) 1965 Days of Our Lives
Notable Actors and Actresses:
2 actresses
Sigourney Weaver (a.k.a. Alexandra) 1949-
Alexandra Maria Lara 1978-
Notable Explorers and Adventurers:
1 explorer
Alexandra David-Néel 1868-1969
Notable Musicians:
1 singer
Natti Natasha (a.k.a. Alexandra) 1986- Latin pop, reggaeton
Olympic Medalists:
4 gold, 2 bronze, 2 silver, 1 bronze/gold, 1 gold/bronze, 1 silver/bronze
(gold) Sandy Neilson (a.k.a. Alexandra) 1972 swimming - 100 m freestyle; swimming - 4x100 m freestyle relay; swimming - 4x100 m medley relay
(silver/bronze) June Croft (a.k.a. Alexandra) 1980; 1984 swimming
(gold) Alexandra Araújo 2004 water polo
(bronze/gold) Alexandra Eremia 2004 artistic gymnastics
(silver) Sasha Cohen (a.k.a. Alexandra) 2006 figure skating
(bronze) Alex Danson (a.k.a. Alexandra) 2012 field hockey
(bronze) Alexandra Tsiavou 2012 rowing
(gold) Alexandra Patskevich 2012 synchronized swimming
(gold) Alex Morgan (a.k.a. Alexandra) 2012 football
(gold/bronze) Alexandra Raisman 2012 artistic gymnastics
(silver) Alexandra Carpenter 2014 ice hockey
Other Royalty:
2 princesses, 1 princess/empress consort, 1 princess/queen consort
Alix of Hesse and by Rhine; Aleksandra of Russia (a.k.a. Alexandra) 1872-1894; 1894-1917 Hesse; Russia
Alexandra of Denmark 1853-1863; 1901-1910 Denmark; United Kingdom
Alexandra, Countess of Frederiksborg 1995-2007 Denmark
Ingrid Alexandra of Norway 2004- Norway
Saints:
1 saint
Saint Alexandra ?-300
Title Characters:
2 books, 1 song
(book) Alexandra 1967 Nicholas and Alexandra
(song) Alexandra 2014 Alexandra
(book) Alexandra Gastone 2015 They Call Me Alexandra Gastone