This is the 3072nd most frequent Spanish word.
luisa
"Luisa" is a Spanish given name, equivalent to "Louise" in English.
In this sentence, 'Luisa' is used as a proper noun, referring to a specific person's name.
Luisa es mi amiga de la infancia.
Luisa is my childhood friend.
Here, 'Luisa' is used as the indirect object in the sentence, showing whom the action is directed towards.
Le di el libro a Luisa.
I gave the book to Luisa.
This sentence uses 'Luisa' as the direct object of the verb 'conocer', asking about familiarity with a specific individual.