EDIT: I briefly forgot this, but there is a similar Korean word "내가" which is "me" or "I", and pronounced "ne-gah". Example usage: 내가 이 밥을 먹었어요. (I ate this food. "Ne-ga ee bap-uhl mug-uss-uh-yo")
EDIT2: Korean is not my native language so forgive me for this, but "you" is usually just 니 ("nee"), and "me" or "I" is just 내 ("ne"), but the 가 ("gah") part is used like a conjunction to connect to the rest of the phrase.
EDIT3: Ok, so I talked with a better Korean speaker about this and 니가 "nee-ga" is sort of a regional dialect (kind of like a slang term) for 너가 "nuh-ga". 니가 "nee-ga" is more commonly used in southern parts of South Korea, as the proper way of saying/spelling "you" is 너가 "nuh-ga". My Korean is influenced with the southern regional dialect as my parents were from that region. Sorry for the possible confusion. (So just "you" is 너 "nuh".)
EDIT4: PSY (of Gangnam Style fame) has a song titled "Champion" that uses 니가 "nee-ga" a lot:https://youtu.be/uA4fV7Y14eg?t=49