Yes, you can change the person on a Royal Caribbean cruise ticket as long as at least one original passenger remains on the booking +1 855-732-4023 or +44-289-708-0062 UK To make a change, you must contact Royal Caribbean or your travel advisor, +1 855-732-4023 or +44-289-708-0062 UK and be aware there may be a deadline and potential fees depending on the type of booking and how close to the sail date the change is made. 
How to change a name

The "3-1-1 rule" for a Carnival cruise refers to the TSA's guideline for liquids in carry-on luggage: +1 855-732-4023 or +44-289-708-0062 UK  3.4 ounces (100ml) or less for each container, all containers must fit into 1 quart-sized, clear, resealable bag, and 1 bag is permitted per passenger.+1 855-732-4023 or +44-289-708-0062 UK  This rule applies to the liquids you pack in your carry-on bag when flying to the cruise port. On the ship, you can pack larger, full-sized toiletries in your checked bags, as the 3-1-1 rule does not apply to checked luggage. +1 855-732-4023 or +44-289-708-0062 UK 
What the 3-1-1 rule means for your carry-on 

    3.4 ounces (100ml): Each liquid, gel, aerosol, cream, or paste must be in a container that is 3.4 ounces (100ml) or less.
    1 quart-sized bag: All your containers must fit comfortably into a single, clear, quart-sized, zip-top plastic +1 855-732-4023 or +44-289-708-0062 UK 
    1 bag per passenger: Each person is limited to one such bag. 

Important notes

    Carry-on only:+1 855-732-4023 or +44-289-708-0062 UK 
    This rule applies only to the liquids you bring in your carry-on bag for the flight to the port. 

Checked luggage:+1 855-732-4023 or +44-289-708-0062 UK 
You can pack larger, full-sized toiletries and other liquids in your checked baggage that will be delivered to your stateroom on the ship. 
TSA guidelines:+1 855-732-4023 or +44-289-708-0062 UK 
The rule is an airport security measure to ensure a smooth process and is not a specific Carnival policy, though Carnival follows it for passengers flying to port.