Cassandra (a.k.a. Alexandra) (f)

Queen Elizabeth II (a.k.a. Alexandra)
1952-2022 
Alexandra Giddens
1939 The Little Foxes

(character) Alexandra
2014 Alexandra

Lexie Carver
1965 Days of Our Lives

Alexandra Borgia
1990 Law & Order

Alex Mack
1994 The Secret World of Alex Mack

Ally Barone
1996 Everybody Loves Raymond

Alexandra Cabot
1999 Law & Order: Special Victims Unit

Alex Eames
2001 Law & Order: Criminal Intent

Alex Quinn
2003 NCIS

Alex Rousseau
2004 Lost

Julie Mayer (a.k.a. Alexandra)
2004 Desperate Housewives

Lexie Grey
2005 Grey's Anatomy

Joan Rivers (a.k.a. Alexandra)
1933-2014 
Sigourney Weaver (a.k.a. Alexandra)
1949- 
Ally Sheedy
1962- 
Alex Kingston
1963- 
Ruth Jones (a.k.a. Alexandra)
1966- 
Alexandra Maria Lara
1978- 
Mena Suvari (a.k.a. Alexandra)
1979- 
Ali Wong
1982- 
Alexandra Daddario
1986- 
Pom Klementieff (a.k.a. Alexandra)
1986- 
Alexandra Roach
1987- 
Alexandra Shipp
1991- 
Sofia Richie (a.k.a. Alexandra)
1998- 
(soccer) Alex Morgan
1989- 
Alexandra David-Néel
1868-1969 
Inna (a.k.a. Alexandra)
1986- 
Natti Natasha (a.k.a. Alexandra)
1986- 
Aleksandra Kollontai (a.k.a. Alexandra)
1872-1952 
(gold) Sandy Neilson
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
2006 figure skating

(bronze) Alex Danson
2012 field hockey

(bronze) Alexandra Tsiavou
2012 rowing

(gold) Alexandra Patskevich
2012 synchronized swimming

(gold) Alex Morgan
2012 football

(bronze/gold) Alexandra Raisman
2012 artistic gymnastics

(silver) Alexandra Carpenter
2014; 2022 ice hockey

Other Royalty:
3 princesses,
1 princess/empress consort,
1 princess/queen consort
Alix of Hesse and by Rhine; Aleksandra Feodorovna (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

Theodora of Liechtenstein (a.k.a. Alexandra)
2004- Liechtenstein

Saint Alexandra
?-300 
Queen Kristina (a.k.a. Alexandra)
1632-1654 