while it's not required, if this is referring to the applicant, and it's something they plan to do anyway, then it's best to change the name BEFORE sending in the application, or at least before getting approved (you can send updated information to CIC while processing). i did not change my name in time, and now it will require much more time to get everything changed over, plus i will have to pay for a new pr card, since i already got my free one in my maiden name. also, this will restrict my traveling, since i'll have to change my passport first, and my passport and pr card won't match until i get a new card. once the applicant lands as pr, everything will be done based on the name on the COPR/PR card.