New answers tagged months
The names of the months came up with them from Bavel. Talmud Yerushalmi Rosh Hashana perek one, halacha two. This Yerushalmi is mentioned in Tosafos Rosh Hashana 7a, d.h. Midivrei. Most of the names are mentioned in megilas Esther and Nechemia. We can estimate then, at least to the latest possible date, based on Achashveirosh's reign. Wiki states ...
The original Hebrew months were numbered only. During the Babylonian exile (around 400CE), the Jew began to use names. See http://www.aish.com/atr/Names_of_Hebrew_Months.html
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