Namesakes
Gregorio of Verucchio
(m) 1225-1343 
Saints
Gregorio Barbarigo
(m) 1625-1697
Saints
Gregorio Grassi
(m) 1833-1900
Saints
Pedro Armendáriz
(middle name Gregorio) (m) 1912-1963
Notable Actors and Entertainers (actor)
Rafael Reyes
(middle name Gregorio) (m) 1849-1921
Other Leaders 1904-1909 Colombia (president)