Some months have the wrong name

The names of the twelve months of the year date from Roman times.

In early Roman Times the year began in March and so September, October, November and December were the Seventh, Eight, Ninth and Tenth months of the year.

Although they no longer are, the names stuck.

The rest of the names are a mixture, mostly made up when the calendar was changed by Julius Caesar.

January was named after Janus, the double faced Roman god of entrances and doorways, looking back to the old year and forward to the new year.

February was named after februsa, the Roman festival of purification.

March stood for Mars, the Roman god of war.

April came from the latin word for opening bud.

May was named for Maia, the goddess of growth.

June came from either Juno, the goddess of Heaven or from the well known Roman family of Junius.

July was named after Julius Caesar himself and...

August was named after Augustus Caesar, the first Roman emperor.