Meaning and name origin
Gregoire \g-regoi-re, gr(e)-goire\ as a boy's name is of Greek origin, and the meaning of Gregoire is "watchful, vigilant". Gregoire is a variant of Gregory (Greek): the first of the 16 popes and 10 saints with the name was called Gregory the Great.
Gregoire is not a popular first name for males but a very popular surname or last name for all people (#5062 out of 88799, Top 6%) (2000 U.S. Census).
A suggested similar baby name is Gregori. Like Gregoire, this name is not commonly used.