I think that I can answer that question for you.
July, which was named after Julius Caesar, used to be called Quintilis, which literally means "fifth" in Latin, because it was the fifth month until the Romans changed the calendar.
https://www.etymonline.com/search?q=July
August, which was named after Augustus Caesar, used to be called Sextilis, which literally means "sixth" in Latin, because it was the sixth month until the Romans changed the calendar.
https://www.etymonline.com/word/August#etymonline_v_18943
SEPTember used to be the 7th month, as the the prefix "sept" has to do with the number 7 as in septuplets.
OCTober used to be the 8th month, as the prefix "oct" has to do with the number 8 as in octopus or octagon.
NOVember used to be the 9th month, as the prefix "nov" has to do with the number 9 as in novena.
DECember used to be the 10th month, as the prefix "dec" has to do with the number 10 as in decade, decimal, or the Decalogue (10 Commandments)
Furthermore, February used to be the 12th month, and this is why leap year occurs at the end of February.
Had the calendar not been changed, the new year would begin in the Spring, and not about a week and a half into Winter as it presently does.
There are SATANIC reasons why the calendar was changed, even though people normally blow a gasket when I mention the following one.
The ancient Romans were into gematria or numerology.
Satan's name first appears in the underlying Hebrew of the Old Testament. In Hebrew, each letter of the alphabet has a corresponding numeric value attached to it. Satan's name in Hebrew consists of three consonants which have the numeric values of 300, 50, and 9. With such being the case, the numeric value of Satan's name is 359.
Well, what is the 359th day on our current greatly-altered calendar?
365 = December 31st
364 = December 30th
363 = December 29th
362 = December 28th
361 = December 27th
360 = December 26th
359 = December 25th or Christmas (Christ Mass) day.
This isn't a coincidence.
Everything in scripture indicates a Springtime birth for Jesus.
Anyhow, God's calendar is the Hebrew calendar, which is a lunar calendar, unlike our Romanized solar calendar, and the new year does begin in the Spring.