This is the 12794th most frequent Korean word.
데니스
"데니스" is the transliteration of the English name "Dennis" in Korean.
In this sentence, '데니스' is used as a proper noun referring to the name of an individual.
데니스는 미국에서 온 친구입니다.
Dennis is a friend from the United States.
Here, '데니스' refers to the same individual named Dennis and is used as the person with whom an activity will take place.
내일 데니스와 축구를 하기로 했어요.
I decided to play soccer with Dennis tomorrow.
In this example, '데니스' is used in the possessive form to indicate something that belongs to Dennis, namely his opinion.