There are 18 mathematicians whose last name begin with CAY.

Cayan, Daniel University of California, San Diego 1990
Caycedo, Juan Diego University of Oxford 2012
Cayci, Semih The Ohio State University 2020
Cayco, Maria Carnegie Mellon University 1985
Cayé, Thomas ETH Zürich 2017
Cayemitte, Fritz Columbia University 2000
Cayetano, Messinger University of Michigan 2002
Cayford, Afton University of California, Los Angeles 1961
Cayirci, Erdal Boğaziçi University 2000
Cayley, Arthur University of Oxford 1864/1865/1875
Cayley, Arthur Universiteit Leiden 1864/1865/1875
Cayley, Arthur University College Dublin 1864/1865/1875
Cayon, Laura Universidad de Cantabria 1993
Cayot, Robert-Olivier Université de Nice-Sophia Antipolis 2001
Cayrols, Sebastien Sorbonne Université 2019
Cayton, Charity Sue-Adams North Carolina State University 2012
Cayton, Lawrence University of California, San Diego 2009
Caywood, Thomas Harvard University 1947