The international term for this event that is capturing the world's attention is Mundial.
The Hebrew word for world is עוֹלָם (oh-LAHM), and the word for cup, or more specifically, goblet, is גָּבִיע (gah-VEE-ah). This is also the term for kiddush cup or becher in Yiddish.
So the Hebrew term for the World Cup is גָּבִיעַ הָעוֹלָם (gah-VEE-ah hah-oh-LAHM).
Thanks, Aaron, for the request.