- Jan [yahn] /yɑn/, 1903–94, Dutch economist: Nobel prize 1969.
- his brotherNi·ko·laas [nik–uh-luh s; Dutch nee-koh-lahs] /ˈnɪk ə ləs; Dutch ˈni koʊˌlɑs/, Niko, 1907–1988, British ethologist, born in the Netherlands: Nobel Prize in medicine 1973.
- Jan (jæn). 1903–94, Dutch economist, noted for his work on econometrics. He shared (1969) the first Nobel prize for economics with Ragnar Frisch
- his brother, Nikolaas (ˈnɪkələs). 1907–88, British zoologist, born in the Netherlands; studied animal behaviour, esp instincts, and was one of the founders of ethology; Nobel prize for physiology or medicine 1973