Namesakes
Jan Heemskerk
(m) 1818-1897 
Dutch Prime Ministers 1874-1877; 1883-1888
Theo Heemskerk
(m) 1852-1932
Dutch Prime Ministers 1908-1913
Femke Heemskerk
(f) 1987-
Olympic Medalists 2008; 2012 swimming (gold/silver)
Marianne Heemskerk
(f) 1944-
Olympic Medalists 1960 swimming - 100 m butterfly (silver)