This is the 7384th most frequent Polish word.
kingi
"Kingi" is the plural form of "kinga," a Polish name.
In this case, 'Kingi' is used to denote location, suggesting going to school with females named Kinga.
Chodzę do szkoły razem z Kingi.
I go to school together with Kingi.
In this sentence, 'Kingi' is used as the possessive form of the name Kinga, indicating ownership of the book.
Książka Kingi jest bardzo interesująca.
Kingi's book is very interesting.
Here, 'Kingi' is plural, referring to multiple females named Kinga.