Jewish calendar has the following months:

Hebrew	English	Number	Length	Civil Equivalent
	ABIB, Aviv, Pagan name is Nisan. 3 names for the same month	1^st Month	30 days	March-April
	Ziv. Pagan name is Iyar.	2	29 days	April-May
	Just called 3^rd Month. Pagan name is Sivan.	3	30 days	May-June
	Just called 4^th Month. Pagan name is Tammuz.	4	29 days	June-July
	Just called 5^th Month. Pagan name is Av.	5	30 days	July-August
	Just called 6^th Month. Pagan name is Elul.	6	29 days	August-September
	Eitanim/Ethanim Hebrew: אֵתָנִים 1 Kings 8:2. Pagan name is Tishrei.	7	30 days	September-October
	Bul.. Pagan name is Cheshvan.	8	29 or 30 days	October-November
	Just called 9^th Month. Pagan name is Kislev.	9	30 or 29 days	November-December
	Just called 10^th Month. Pagan name is Tevet.	10	29 days	December-January
	Just called 11^th Month. Pagan name is Shevat.	11	30 days	January-February
	Just called 12^th Month. Pagan name is Adar I.	12	30 days	February-March
	Just called 13^th Month. Pagan name is Adar II. (Leap years only) (Called Adar Beit in Leap years)	13 (13 in leap years)	29 days	February-March

Before the Israelites went into Babylon, the Scriptures only had four months of the calendar identified by name. The others just had numbers.

Aviv The first month. Pagan name Nissan
Ziv the second month. Pagan name Iyar
Eitanim the seventh month. Pagan name Tishrei.
Bul the eighth month. Pagan name Chesvan.

Before going into Babylon the months were counted in numeric order starting from Aviv.

Therefore any time a person mentioned the number of a month he was recalling the Exodus from Egypt. Egg: If you are in the 9^th month= you are nine months from the Exodus from Egypt. The numeric naming served as a constant reminder of the deliverance from Egypt.

But after being delivered from Egyptian captivity and being in other Pagan lands, the Israelites started using the Pagan names of the months of the Pagan countries that they were in.

We as Christians should only use the 4 original month names that are in God’s Bible, and use numbers for the rest of God’s months= do NOT use Pagan Names for months.