Namesakes
Eurovision Song Contest Winners:
1 winner
Teddy Scholten (a.k.a. Margaretha) 1959 Netherlands 
Notable Actors and Entertainers:
2 presenters, 1 dancer
Mata Hari (a.k.a. Margaretha) 1876-1917
Linda de Mol (a.k.a. Margaretha) 1964-
Monique Smit (a.k.a. Margaretha) 1989-
Notable Athletes:
1 soccer
(soccer) Vivianne Miedema (a.k.a. Margaretha) 1996-
Notable Musicians:
1 singer
Teddy Scholten (a.k.a. Margaretha) 1926-2010
Notable Politicians and Statespeople:
1 politician
Marga Klompé 1912-1986
Olympic Medalists:
1 bronze, 1 silver
(bronze) Willemijn Duyster (a.k.a. Margaretha) 1996 field hockey
(silver) Margaretha Sigfridsson 2014 curling
Other Royalty:
2 princesses
Margaretha of Sweden 1899-1977 Sweden
Margaretha of Sweden 1934- Sweden
Saints:
1 blessed
Blessed Margareta Kratz (a.k.a. Margaretha) 1430-1532