The month names suggest that March is the first month of the year, yet the year on the modern Anglophone calendar begins with January. When and why was March chosen to start the year initially, and when and why did it switch to January starting the year?
Check out the FAQ section on calendars. This thread in particular seems to be the one you want:
Why does the new year start 10 days after the solstice? by /u/aescolanus
But the other ones might be of interest as well.