Lulu

Lulu is a diminutive of Louise. Louise originates in Germanic languages and means "well-known fighter". It is a feminine form of Louis. It has always been a popular name among royalty and it used to be a very popular feminine given name in the United States as well. Lately, its usage has declined. It remains popular in French-speaking countries. Some sources suggest Lulu might also originate in Arabic language, meaning "pearl".