This is the 5630th most frequent Arabic word.
كيريل
"كيريل" is the Arabic transliteration of "Cyril," a male given name.
Here, 'كيريل' is the name of a person, used as the subject of the sentence.
كيريل يدرس في الجامعة.
Kyryl studies at the university.
In this case, 'كيريل' again refers to a person, the direct object of the verb 'قابلت' meaning 'I met'.
قابلت كيريل في المكتبة.
I met Kyryl at the library.
Here 'كيريل' identifies the individual responsible for writing the book, showing possession or authorship.