Louisa \lo(ui)-sa\ as a girl's name is a variant of Louise (Old German), and the meaning of Louisa is "famous warrior".
The baby name Louisa sounds like Luisa, Louiza and Lluisa. Other similar baby names are Lovisa, Lusa, Lisa, Leisa, Elouisa, Lois, Jolisa, Lorissa, Larisa, Loida, Loris, Loria, Luise, Loyise, Lowise, Louisina, Loise and Luiza.