The Gemmorah in [Jerusalem Rosh Hashana 6a][1] explains the process of adopting the Babylonian names on Months instead of Biblical ones.

דא"ר חנינה שמות חדשים עלו בידם מבבל
R'Hanina said: the names of the Months were brought with them from Babylon

[The WIKI on Babylonian_calendar][2] states that although every month is associated with a deity, [Tammuz][3] specifically bears the name of their god. The WIKI also says that the name of the god was widely known (and even worshipped) by the Israelites:

The cult of Ishtar and Tammuz may have been introduced to the Kingdom of Judah during the reign of King Manasseh and the Old Testament contains numerous allusions to them. Ezekiel 8:14 mentions Tammuz by name: "Then he brought me to the door of the gate of the Lord's house which was toward the north; and, behold, there sat women weeping for Tammuz. ..."

Tammuz seems to be the name of a deity or connected to idolatry. How is it that it became the name of a Jewish month given the prohibition of וְשֵׁ֨ם אֱלֹהִ֤ים אֲחֵרִים֙ לֹ֣א תַזְכִּ֔ירוּ לֹ֥א יִשָּׁמַ֖ע עַל־פִּֽיךָ, namely, that it is forbidden to speak the names of such deities?

  • presumably it was originally the pagan name for that month/time of year (likely associated with their zodiac)... see en.wikipedia.org/wiki/Tammuz_(Babylonian_calendar) – Loewian Jul 2 '19 at 5:36
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    The Talmud tells us that all the names of the months were brough back from Bavel - I guess this includes Tamuz, – Danny Schoemann Jul 2 '19 at 13:01
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    It's unclear as to what the concern is in your question. Offhand, I don't see a problem with a prohibition of idol worship by naming a month after another nation's god. I'm inferring that this is your concern. If it is, please edit a source relating the two concepts. – DanF Jul 2 '19 at 13:44
  • There are a bunch of examples where avodah zara names were used and the Rishonim and Achronim deal with many of them. ממון is a good example since it was the name of the money god, but then the word became more associated with the money and lost its initial connection, Taamuz avodah zara doesnt exist anymore and its possible back then the name of month took the place of the god it used to stand for. It is also known that taamuz was killed,so no longer exists. – sam Jul 2 '19 at 14:44
  • Found a very interesting and profound explanation here: chabad.org/library/article_cdo/aid/703099/jewish/… – user16403 Jul 3 '19 at 5:50

Perhaps the answer is that once the month was named after the deity, the name Tammuz is no longer solely considered the name of a deity, but rather the name of a month. The advantage of this answer is that, if true, it would also explain our use of the names of the days of the week, such as Tuesday, Wednesday, Thursday, Friday and Saturday, which are all named for pagan deities. Although the origins of these names are pagan, they have taken on a new meaning and we do not need to look back at the etymology of these words.

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    How does this answer the question, which asks how this became the name of the month, not how it’s permissible to use it as such? – DonielF Jul 2 '19 at 15:49
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    It is not clear what the question is. If it is how it became the name of the month, then obviously it is because שמות חדשים עלו מבבל, but if the question is how they could have taken such a name with them then this is a plausible answer – wfb Jul 2 '19 at 15:52
  • @wfb so why haven't you voted to close as Unclear? – Double AA Jul 3 '19 at 11:44
  • @DoubleAA en.wikipedia.org/wiki/Principle_of_charity – wfb Jul 3 '19 at 16:31
  • a very small amount of people today follow the babylonian pantheon – KapinKrunch Sep 13 '19 at 2:47

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