This is the 11365th most frequent Korean word.
김지우
"김지우" is a common Korean name and does not have a specific definition other than being a proper noun for an individual.
김지우 is used here as a subject, referring to a person named Kim Ji-woo.
김지우가 오늘 학교에 갔어요.
Kim Ji-woo went to school today.
김지우 is used here as an object, indicating the person with whom the speaker has had an encounter.
저는 김지우를 만난 적이 있어요.
I have met Kim Ji-woo before.
김지우 is used in the possessive form to indicate ownership, showing that the book belongs to Kim Ji-woo.