There are 5 mathematicians whose last name begin with GREK.

Grek, A. Moscow State Pedagogical Institute 1968
Grekos, Georges Université Bordeaux 1 1982
Grekova, Elena F. St. Petersburg Technical University 1999
Grekova, Elena F. Institute for Problems in Mechanics of the Russian Academy of Sciences 1999
Grekow, Jacek Polish-Japanese Institute of Information Technology 2009