This is the 6589th most frequent Japanese word.
トム
"トム" is the Japanese katakana rendering of the name "Tom."
Subject name, identifying who performed the action.
トムは昨日のパーティーに来た。
Tom came to yesterday's party.
Possessive form, indicating ownership by Tom.
トムの家はとても大きい。
Tom's house is very large.
Direct object, indicating who is liked by the subject.