Yes, Name changes (first or last) or substitutions can be made. To change the name on a Royal Caribbean Cruise ticket contact Royal Caribbean Cruise Customer Service. Royal Caribbean cruise name change policy allows guests to transfer bookings to another person for a fee, typically around $100 to $200 per person, depending on the specific circumstances. Name changes must be requested at least 24 hours before departure.
https://www.tripstrolly.com/blogs/royal-caribbean-cruise-name-change-policy