Namesakes
Dutch Prime Ministers:
2 prime ministers
Jan Heemskerk 1874-1877; 1883-1888 
Theo Heemskerk 1908-1913
Olympic Medalists:
1 gold/silver, 1 silver
(silver) Marianne Heemskerk 1960 swimming - 100 m butterfly
(gold/silver) Femke Heemskerk 2008; 2012 swimming