AD is not used in the Jewish calendar. It is only used on the Gregorian (Christian) Calendar.
5777-577821 Sep AD 2017 = 1 Tis AM 5778
Kislev is the 9th Month on the Hebrew Calendar, but its name has no Hebrew meaning other than the name of the month. The word was probably borrowed from another language, probably Akkadian.
There is no Hebrew name for Adele. But if you are looking to choose a Hebrew name with a similar sound, here are some suggestions: Ad (עד) Ad El (עד־אל) Adiel (עדיאל) Adina (×¢×“×™× ×”)
Av is the 5th Month of the year on the Hebrew calendar. It usually occurs in June or July
Nisan is the 7th month in the Hebrew calendar. The word comes from Babylonian, and has an unknown meaning.
The Gregorian Calendar is solar and the Hebrew Calendar is lunisolar.
In the Hebrew calendar, the month of Av is followed by the month of Elul.
1 week = 1 week on the Hebrew calendar. (The Hebrew week is the same length as the week on the Western calendar)
Kislev is the 9th month on the Hebrew calendar, corresponding to November or December. It has no meaning in English.
There isn't any festival celebrated along with Christmas as per the Hebrew calendar, since Christmas is not tied to the Hebrew calendar. (So every year, Christmas falls on a different date on the Hebrew calendar).
The Hebrew calendar is used in Israel, and by Jews all over the world.
A Hebrew calendar website can help you with that.