I love Louisa. It is lovely and old-world sounding. It's much less wheezy sounding than Louise.
Instead of Louise, LouisA gives a little "punch" at the end of the name
Louisa is a feminine form of Louis. In the USA it was most popular in the late 1800s. In the 1900s it fell off in popularity and was replaced by the French form, Louise. See Also: Louiza, Lewis, Louise