November: [13] The ancient Romans calculated the beginning of their year from March. Hence they named their ninth month novembris or november mēnsis. November and novembris were derivatives of Latin novem ‘nine’. [November etymology, November origin, 英语词源]
c. 1200, from Old French novembre and directly from Latin November (also Novembris (mensis)), from novem "nine" (see nine). The ninth month of the Roman calendar, which began in March. For -ber see December. In Old English, it was Blotmonað "month of sacrifice," literally "blood-month," the time when the early Saxons prepared for winter by sacrificing animals, which they then butchered and stored for food.