This is the 2474th most frequent Polish word.
francisco
The word "francisco" is not Polish; it is typically a Spanish or Portuguese given name.
In this sentence, "Francisco" refers to a person's name, used as the subject of the sentence.
Francisco mieszka w Warszawie.
Francisco lives in Warsaw.
Here, "Francisco" functions as the subject in an interrogative sentence referring to the same person's name.
Czy Francisco odwiedzi nas w przyszłym miesiącu?
Will Francisco visit us next month?
In this sentence, "Francisco" is used as the instrumental case indicating who enabled the understanding of Spanish culture.