Yes, minor name changes (e.g. spelling corrections or updating from a maiden to a married name) can be made at no additional cost.
If you have received a Gift Card, you can update the name directly in the Received Gift Card section of your myRyanair portal. Once the change is made, a new voucher code will be issued to the recipient, and the original voucher code will be automatically voided.
Note: If you use a Gift Card to pay for your booking, you cannot change the name on the booking after payment is completed.