Usually, you have to go through the Cruise line to do this. And if the ticket change involves someone not related to you, there will probably be a fee to the original ticket holder.

Yes, you can generally change who is going on a cruise after booking, but it is subject to the cruise line's specific "Name Substitution" policies and can incur significant fees. In 2026, most major lines like Royal Caribbean and Carnival allow one name on a reservation to be changed, provided at least one of the original passengers remains on the booking. If you try to change both names, it is often treated as a cancellation and a re-booking at current market rates. Fees for these changes typically range from $50 to $150 per person, though some premium or "flexible" fares may waive this. It is critical to note that name changes are usually prohibited once you are within 30 to 60 days of departure, as manifests must be finalized for border security. If your cruise includes a "Fly-Cruise" package, changing the name is much more difficult and expensive due to strict airline anti-transfer laws, often requiring the purchase of a completely new flight ticket at the current price.