guillemet
/ˈɡiːmeɪ//ɡijmɛ/
noun
Each of a pair of punctuation marks (« ») used as quotation marks in French and other European languages.
Origin
French, of uncertain origin; probably derived from the male forename Guillaume or the surname Guillemet.
==========
William (AKA Guillaume) wrote fluent English and French. He was impeccable in his use of quotation marks when writing English dialog and took care to use guillemets for French.
"Hello, friend!"
«Bonjour, mon ami!»