The person who carries your luggage can be called a few different things, depending on the context:
Bellhop / Bellboy / Bellperson
This is the classic term used in hotels. They assist guests with luggage from the vehicle to the room and vice versa. The name comes from the bell at the front desk that was historically rung to summon them.
Porter
A more general term used in hotels, train stations, airports, and cruise ships. It refers to someone employed to carry luggage and assist travelers.
Skycap
Specifically used at airports for the porter who assists with luggage at the curb outside the terminal (checking bags, handling them to the airline, etc.).
Concierge (in some contexts)
While a concierge primarily handles guest services (bookings, recommendations, etc.), at smaller hotels they might also manage luggage assistance.
Luggage Porter / Baggage Handler
“Baggage handler” usually refers to airline staff who load/unload luggage from planes, not the person assisting you directly. “Luggage porter” is clearer for personal assistance.
It’s always polite to thank them, and in many countries, a tip is customary for their service.