Namesakes
Danish Kings and Queens:
2 queens
Queen Margrete I (a.k.a. Margrethe) 1387-1412 
Queen Margrethe II 1972-2024
Norwegian Kings and Queens:
1 queen
Queen Margrete (a.k.a. Margrethe) 1388-1412
Olympic Medalists:
1 bronze, 1 gold/silver
(gold/silver) Karen Harup (a.k.a. Margrethe) 1948 swimming - 100 m backstroke; swimming - 400 m freestyle; swimming - 4x100 m freestyle relay
(bronze) Princess Nathalie of Sayn-Wittgenstein-Berleburg (a.k.a. Margrethe) 2008 equestrian
Other Royalty:
1 princess
Isabella of Denmark (a.k.a. Margrethe) 2007- Denmark
Swedish Kings and Queens:
1 queen
Queen Margareta (a.k.a. Margrethe) 1389-1412