January named after
Janus
(jāˈnəs)
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
April from
aperire
Latin for “to open” (buds)
May named after
Maia
(māˈə, mĪˈə)
the goddess of growth of plants
June from
junius
Latin for the goddess, protector of women
July named after
Caius Julius Caesar
Roman  general.
August named after
Augustus (ôgŭsˈtəs, əgŭsˈ–) 
the first 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”