Namesakes
Olympic Medalists:
1 bronze, 1 gold, 1 silver
(gold) Nida Senff (a.k.a. Jacoba) 1936 swimming - 100 m backstroke 
(bronze) Tineke Lagerberg (a.k.a. Jacoba) 1960 swimming - 400 m freestyle
(silver) Coby van Baalen (a.k.a. Jacoba) 2000 equestrian