Of Germanic origin.
From the masculine name Louis, meaning “famous warrior”.
It was a popular feminine name in the 19th century.
In the last decades it’s more common as a middle name.
Other forms of the name are: Louise, Lou, Lulu, Luisa, Aloisia, Gina, Luann, Lovisa.
Famous bearers are Louisa May Alcott, Louisa Connolly Burnham, Louisa Lytton.
American author Louisa May Alcott, wrote several children’s books and is best known for the novel “Little Women”, that still remains among the most popular books among young readers.
It was adapted for the movies and a Broadway musical production as well.