You will need to apply for a change of name.
This is because people who changed their last name at the time they married must file a change of name application and obtain a legal change of name if they want to change their name during the marriage. This is so, even if the person wants to resume the use of their last name before marriage or birth surname.
A divorced or widowed person may resume using the surname they used before marriage, or at birth, without a formal name change through Vital Statistics.
Application forms can be obtained by contacting Vital Statistics, via
telephone at(NNN) NNN-NNNN(toll free 1-800-282-8069 in Manitoba only),
fax at(NNN) NNN-NNNN or email [email protected]
are submitted to Vital Statistics.
Once you change your name you are responsible for informing all the various governmental agencies.
Here's a link to a list of whom to contact:http://vitalstats.gov.mb.ca/pdf/Changing_identification.pdf
Let me know if you need further clarification.