guillemet
noun
guil·le·met ˌgē-(y)ə-ˈmā 
ˌgi-lə-ˈmet
ˌgi-lə-ˈmet : either of the marks « or » used as quotation marks in French writing
Word History
Etymology
French, from diminutive of Guillaume William (perhaps a printer's name)
First Known Use
circa 1905, in the meaning defined above