This is the 5334th most frequent Japanese word.
jack
The Japanese word "ジャック" (jakku) is a loanword from English, often referring to "Jack" (a name), a card rank, or a mechanical "jack" for lifting objects.
ジャック (Jack) is used as a proper noun, referring to a person's name.
ジャックは友達と公園で遊んでいます。
Jack is playing with friends in the park.
ジャッキ (jack) is used as a tool (mechanical jack) for lifting vehicles.
車のタイヤ交換にジャッキを使います。
I use a jack to change the car tire.
ジャック (jack) here refers to a socket or connector for headphones.