There are 11 mathematicians whose last name begin with CLAA.
| Claas, Oliver | Universität Bielefeld | 2017 |
| Claas, Willem | Universiteit Utrecht | 1951 |
| Claas, Willem | Universiteit Leiden | 1977 |
| Claasen, Hendricus | Universiteit Utrecht | 1976 |
| Claassen, Emil | Universität zu Köln | 1963 |
| Claassen, Hermann | Universität Hamburg | 1922 |
| Claassen, Kyle | University of Kansas | 2018 |
| Claassen, Roger | University of Maryland College Park | 2008 |
| Claassen, Thomas | Radboud Universiteit Nijmegen | 2013 |
| Claassen, Volkert | Universiteit van Amsterdam | 1952 |
| Claassens, Floris | University of Kent, Canterbury | 2020 |