Tycoon (大君), honcho (班長), kudzu (葛 クズ), skosh (少し), ramen (ラーメン), futon (布団) – which means something different in Japanese (mattress you lay on the floor), Sudoku (数独), rickshaw (力車).
http://www.merriam-webster.com/words-at-play/8-english-words-that-come-from-japanese/tycoon