In some cultures and societies, women will be listed with their new last name (their husband's last name) in records created after their marriage. In others, women are almost always listed with their original surname--even after their marriage. Records in Sweden, Belgium, and other parts of Europe frequently list women with the surname they had at birth, even after their marriage. Find out what the practice was in your specific areas of research before making conclusions.
It is always wise to remember that cultural practices and record-keeping norms can vary from one ethnic region to another.