Namesakes
Dutch Prime Ministers:
1 prime minister
Jacob de Kempenaer (a.k.a. Jacobus) 1848-1849 
Hall-of-Famers:
1 football
(football) Jim Thorpe (a.k.a. Jacobus) 1963
Nobel Prize Winners:
1 chemistry
(chemistry) Jacobus Henricus van 't Hoff 1901
Notable Actors and Entertainers:
1 actor, 1 comedian
Jim Thorpe (a.k.a. Jacobus) 1887-1953
Youp van 't Hek (middle name Jacobus) 1954-
Notable Artists:
1 painter
Lucebert (middle name Jacobus) 1924-1994
Notable Athletes:
1 cycling, 1 football, 1 rugby
(football) Jim Thorpe (a.k.a. Jacobus) 1887-1953
(cycling) Jaco Venter 1987-
(rugby) Willie le Roux (middle name Jacobus) 1989-
Notable Politicians and Statespeople:
1 politician
Koos Andriessen 1928-2019
Notable Scientists and Inventors:
1 astronomer, 1 chemist
Jacobus Kapteyn 1851-1922
Jacobus Henricus van 't Hoff 1852-1911
Notable Writers:
1 poet, 1 poet/author
Lucebert (middle name Jacobus) 1924-1994
Joost Zwagerman (middle name Jacobus) 1963-2015
Olympic Medalists:
2 gold, 1 bronze, 1 silver
(gold) Jim Thorpe (a.k.a. Jacobus) 1912 decathlon; pentathlon
(gold) Jo van Gastel (middle name Jacobus) 1920 archery - moving target 28 m, team
(bronze) Joop Rohner (middle name Jacobus) 1948 water polo
(silver) Dick Quax (middle name Jacobus) 1976 5000 m
Saints:
2 blessed, 1 saint
Blessed Jacobus of Voragine 1228-1298
Blessed Giacomo Benefatti (a.k.a. Jacobus) ?-1332
Saint Jacobus Lacobs ?-1572