There are 11 mathematicians whose last name begin with THAC.

Thach, Chau University of Washington 2000
Thach, Thuan University of Alberta 1998
Thacher, Jennifer University of Colorado at Boulder 2003
Thacher, Stephanie University of Virginia 1999
Thacker, Debleena Indian Statistical Institute, Delhi Centre 2015
Thacker, John Brown University 1974
Thacker, John Cornell University 2006
Thacker, Kevin University of Warwick 1979
Thacker, Michael University of Oregon 2016
Thacker, II, Leroy Virginia Commonwealth University 2003
Thackray, Jonathan University of Cambridge 1982