What does Guillemette mean?
Guillemette /guil-le-mette/ [3 sylls.] as a girls' name. Guillemette's root is Old German, and Guillemette means "determined protector". Guillemette is a version of Wilhelmina (Old German). Guilmette is a familiar last name.
How popular is Guillemette?
Guillemette is an unusual first name for females but a very prominent last name for all people (#24061 out of 150436, Top 16%). (2000 U.S. Census)
Shown below is a comparison of the usage of the girl name Guillemette and affiliated names. Wilhelmina is the only popular variation form of Guillemette (unlisted). Adoption of this girl name was at its highest during 1880-1889 (usage of 0.764%) and is now much lower, with Wilhelmina becoming less in vogue. (Top 1000 Birth Names Records, 2014)