Suldreen is the Enlightened Language word for Moonlark. Sophie said this word when she was born, and her human family thought that she was saying Soybean. It became an annoying nickname commonly used by her dad and Amy. Later on Sophie figured out that the word “suldreen“ is actually Moonlark in the Enlightened Language. This was significant because the name of the project she was involved in was named Project Moonlark by Calla.