There are at least 4 artists with this name:
1) Doris Nefedov, born Treitz, (May 19, 1942 - July 31, 1969) was a German singer who performed under the stage name Alexandra.
Nefedov was born on May 19, 1942 in Heydekrug, Memelland (today: Silute, Lithuania). Her first hit single, "Zigeunerjunge" ("gypsy boy"), came out in 1967; several more followed, including "Sehnsucht" ("yearning"), "Schwarze Balalaika" ("black balalaika") and "Mein Freund, der Baum" ("my friend, the tree"). Nefedov performed songs in several other languages besides German including French, English, Russian and Hebrew.
Nefedov and her mother died in a car accident near Tellingstedt, Holstein underway to a vacation on the island Sylt on July 31, 1969. Her six year old son survived with minor injuries. A biography was published in 1999 by movie director Marc Boettcher; Boettcher received several anonymous threats while researching the circumstances of Nefedov's death, and announced that he would push for a new investigation of the circumstances of her death in 2004 after further research, citing former Stasi documents that revealed that Nefedov's lover Pierre Lafaire was a US-American secret agent as well as testimonies contradicting the documented results of the original investigation.
2) Alexandra (Aleksandra Jabłonka; born 2nd April 1988, in Kętrzyn, Poland) is a Polish pop singer, currently signed to EMI Music Poland.
3) Alexandra (Maria Jose Lefty, born April 25, 1950, Fundão, Portugal). Opted initially for Marizé as a stage name and then changed to the artistic name Alexandra. She has authored more than 10 albums and 15 singles.
4. Alexandra, Countess of Frederiksborg (born on 30 June 1964 in Hong Kong as Alexandra Christina Manley) is a noblewoman and a former member of the Danish royal family. Alexandra Manley was born in Hong Kong to a English-Chinese father and a Czech-Austrian mother. From 1995-2005, she was married to Prince Joachim of Denmark, the younger son of Queen Margrethe II of Denmark. After her divorce, she stayed in Denmark and later married cinematographer Martin Jørgensen in 2007. The couple divorced in 2015. Alexandra's debut single, "Wash Me Away, was released on 2 November 2018 through Sony Music Denmark.