There are 30 mathematicians whose last name begin with XA.

Xaba, Busa University of Arizona 1984
Xaba, Enoch University of California, Berkeley 1997
Xambó-Descamps, Sebastià Universitat de Barcelona 1981
Xandri Antuña, Juan Massachusetts Institute of Technology 2013
Xantcha, Qimh Stockholm University 2010
Xanthakos, Ioannis Imperial College London 2004
Xantheas, Sotirios Iowa State University 1991
Xanthidis, Marios University of South Carolina 2022
Xanthopoulos, Basilis The University of Chicago 1978
Xanthopoulos, Pavlos National Technical University of Athens 2003
Xanthopoulos, Petros University of Florida 2011
Xanthopoulos, Stilianos University of London 1992
Xarez, Isabel Margarida Universidade de Aveiro 2013
Xarles, Xavier Universitat Autònoma de Barcelona 1993
Xausa, Ilaria Universität der Bundeswehr München 2015
Xavier, Alinson Santos University of Waterloo 2017
Xavier, Eduardo Universidade Estadual de Campinas 2006
Xavier, Fernando Universidade Federal de Pernambuco, Recife 2000
Xavier, Francisco Instituto de Matemática Pura e Aplicada 1994
Xavier, Frederico University of Rochester 1978
Xavier, Joao Instituto Superior Técnico 2002
Xavier, João Universidade de Brasília 1988
Xavier, Lambin
Xavier,  
Xavier, Patrick Cornell University 1992
Xavier, Vanessa Université de Genève 2021
XAVIER, Juliana Université Sorbonne Paris Nord 2011
Xavier da Silveira, Luís Fernando University of Ottawa 2020
Xavier de Souza, Fernando Universidade Federal de Pernambuco, Recife 2000
Xavier de Souza, Samuel Katholieke Universiteit Leuven 2007