Namesakes
Olympic Medalists:
1 bronze, 1 silver
(bronze) Margarete Adler 1912 swimming - 4x100 m freestyle relay 
(silver) Corinna Lingnau (middle name Margarete) 1984 field hockey
Other Royalty:
2 princesses, 1 archduchess
Luise Margarete of Prussia 1860-1917 Prussia
Margarete Sophie of Austria 1870-1902 Austria-Hungary
Viktoria Margarete of Prussia 1890-1923 Prussia