Meaning and name origin
Greg \g-reg\ as a boy's name is of Greek origin, and the meaning of Greg is "watchful, vigilant". Greg is a variant of Gregory (Greek): the first of the 16 popes and 10 saints with the name was called Gregory the Great.
Greg is a very popular first name for males (#174 out of 1220, Top 14%) and also a very popular surname or last name for all people (#22245 out of 88799, Top 25%) (2000 U.S. Census).
Displayed below is the baby name popularity of the name Greg for boys. Greg reached its highest rank of #105 in the U.S. in 1960-1969. (2014 statistics).