Namesakes
Olympic Medalists:
1 bronze, 1 silver
(bronze) Margarete Adler 1912 swimming - 4x100 m freestyle relay 
(silver) Corinna Lingnau (a.k.a. Margarete) 1984 field hockey
Other Royalty:
2 princesses
Luise Margarete of Prussia 1860-1917 Prussia
Viktoria Margarete of Prussia 1890-1923 Prussia