In Quebec, the Civil Code requires parents to assign their child only one surname (either a single or compound surname) derived from their respective surnames. Compound surnames may not have more than two parts, with or without hyphens. Thus, a couple named Joseph BOUCHARD-TREMBLAY and Marie DION-ROY could give their children the surnames:
BOUCHARD
TREMBLAY
DION
ROY
BOUCHARD-TREMBLAY
DION-ROY
BOUCHARD-DION
BOUCHARD-ROY, and so on.
In Quebec, the law provides that spouses retain their respective birth names when they are married.
I believe this is a thing in Quebec.
from https://culturalatlas.sbs.com.au/canadian-culture/canadian-culture-naming
In Quebec, the Civil Code requires parents to assign their child only one surname (either a single or compound surname) derived from their respective surnames. Compound surnames may not have more than two parts, with or without hyphens. Thus, a couple named Joseph BOUCHARD-TREMBLAY and Marie DION-ROY could give their children the surnames:
In Quebec, the law provides that spouses retain their respective birth names when they are married.