Answer: Little Lotte is the name of a character in a poem called A Child's first sorrow by Andreas Munch. Christine and Raul used to read it before her father died, and Christine adopted the name. It is also a name of an old game where the little lotte has too chose from three items.
Step-by-step explanation:
In Leroux, Little Lotte is a the character in the stories Christine's dad used to ... playing games like that and it stands to reason that it's something that stuck ... ALW, Hart & Co. to the Little Lotte that is mentioned in the original novel. ... found that Little Lotte reference and connected it to Phantom of the Opera.