January: named after Janus, protector of the gateway to heaven
February: named after Februalia, a time period when sacrifices were made to atone for sins
March: named after Mars, the god of war, presumably signifying that the campaigns interrupted by the winter could be resumed
April: from aperire, Latin for “to open” (buds)
May: named after Maia, the goddess of growth of plants
June: from junius, Latin for the goddess Juno.
July: named after Julius Caesar
August: named after Augustus, the Roman Emperor
September: from septem, Latin for “seven”
October: from octo, Latin for “eight”
November: from novem, Latin for “nine”
December: from decem, Latin for “ten”