American First Ladies: 1 first lady
Louisa Adams   1825-1829  
Fictional Characters from Books: 2 characters
Louisa Musgrove   1818   Persuasion  
Louisa Gradgrind   1854   Hard Times  
Notable Actors and Actresses: 2 actresses
Jean Louisa Kelly   1972-  
Rebecca Ferguson (a.k.a. Louisa)   1983-  
Notable Writers: 1 author
Louisa May Alcott   1832-1888  
Other Royalty: 1 princess, 1 queen consort
Marianne of the Netherlands (a.k.a. Louisa)   1815-1883   Netherlands  
Wilhelmine of Prussia (a.k.a. Louisa)   1815-1837   Netherlands  
Saints: 2 blessed
Blessed Louise of Savoy (a.k.a. Louisa)   1461-1503  
Blessed Ludovica Albertoni (a.k.a. Louisa)   1473-1533