You can change your name in your CaRMS Online account at any time. Simply log into your CaRMS Online account, click on your name located at the top-right and select "User Information", as pictured below.
Once the changes have been made, click "Save".
If you're an applicant, you will also need to upload documentation showing your change of name and assign it to programs before your match cycle's application deadline.
For more information: https://carms.zendesk.com/hc/en-us/articles/360002629612