About the Guay-Castonguay surname
The surname Guay-Castonguay is associated with a patronymic formation. Guay-Castonguay is a compound surname. Its form combines several family-name elements; depending on the line, this may reflect a dit name, the joining of two surnames, or a more recent civil-status development. A patronymic formation of this kind shows how an older personal name could develop into a family name. Guay-Castonguay is a compound or hyphenated surname. For a particular family line, early records can show whether this form was long established or resulted from the joining of two surnames later in the family's history. In the normalization used for some LAFRANCE searches, the surname is also matched through the form “guay castonguay”; this search variant can be useful when accents, spaces, or punctuation differ.
Pronunciation:
Gouè-kas-ton-gouè/ɡuɛkastɔ̃ɡuɛ/