- Swedish physicist: Nobel Prize 1924.
- Kai (kaɪ). 1918–2007, Swedish physicist who worked on electron spectroscopy: Nobel prize for physics 1981
- his father, Karl Manne Georg (kɑːrl ˈmanə ˈjeːɔrj). 1886–1978, Swedish physicist, who discovered the M series in X-ray spectroscopy: Nobel prize for physics 1924
