Meaning A boy's name of Latin origin, it means "king." Origin of Rex Latin +-100%Zoom level changed to 1 Popular Middle Names Robert, Russell, Ryder, Shepherd, Theron, William, Xavier, Alessandro, Alfonso, Andrew Pronunciation 🔊 Listen Rex REHKS Similar Names Bhoomindra Phaneesh King Roary Ruairi Ryan Ruy Bhupinder Bhoopendra Bhupendra Year by Year Popularity of Rex