Naming August – Augustus Caesar
August is the eighth month of the year in the Gregorian calendar and its predecessor, the Julian calendar.

The month of August was originally named Sextilis in Latin since it was the sixth month in the ancient Roman calendar. 

The name of the month was changed to August in honor of Augustus Caesar in 8 BCE.
Latin name – Augustus mensis – Month of Augustus
Latin – sextilis mensis – Sixth month
Anglo-Saxons – Weod Monath – Weed month

History of August:

August was originally Sextilis, the sixth month in the Roman calendar and consisted of 31 days. It became the eighth month with a length of 29 days around 700 BCE when January and February were added to the year. 

Julius Caesar added two days to the month around 45 BCE. It was later renamed to honor Augustus Caesar in 8 BCE.

According to the Roman calendar (Gregorian calendar), all the months including July were dedicated and named in the honor of their pagandeities (gods), and this was a ritual done so that the energies of the month may reflect the spiritual environment of the deity they honor in the month.

In the ancient days, goddess Nemoralia was worshiped during the full moon of August as symbolic sign that she was the giver of the full moon energies of the month of August.

Here below a some pagan festivals which are celebrated in August.

In ancient Rome, Supplicia canum was held on August 3, Lychnapsia was held on August 12, Nemoralia was held from August 13–15 (or on the full moon of August), Tiberinalia and Portumnalia were held on August 17, Consuales Ludi was held on August 18, Vinalia rustica was held on August 19, Vulcanalia.was held on August 23, Opiconsivia was held on August 25, and Volturnalia was held on August 27. These dates do not correspond to the modern Gregorian calendar.