Namesakes
Nida Senff
(a.k.a. Jacoba) (f) 1920-1995 
Olympic Medalists 1936 swimming - 100 m backstroke (gold)
Tineke Lagerberg
(a.k.a. Jacoba) (f) 1941-
Olympic Medalists 1960 swimming - 400 m freestyle (bronze)
Coby van Baalen
(a.k.a. Jacoba) (f) 1957-
Olympic Medalists 2000 equestrian (silver)