If by "the Macbeth book" you mean Shakespeare's play, Macbeth stays at various castles. The castle where he murders Duncan is at Inverness (It's on Loch Ness in the northeastern part of the country) The castle where he is attacked by the English army supported by the Scottish exiles is at Dunsinane Hill, about halfway between Perth and Dundee and straight north of Edinburgh on the east coast of Scotland
The forest outside Macbeth's castle is called Birnam Wood.
Duncan's decision to name his son, Malcolm, as his heir instead of Macbeth, and his decision to stay at Macbeth's castle without informing him both upset Macbeth.
there is no name (that i know of) mentioned. in the book, it just says that it is in Volterra, Italy. Castle Volturi
Seyton was an officer who attended and served Macbeth. He was mentioned by name in Act 5 Scene 3 Line 19. He confirmed the massing of the combined English-Scottish forces against Macbeth [Line 31]. He reappeared in Scene 5, and confirmed the fears of the castlewomen at the coming battle and the death of Lady Macbeth [Line 16].
Beowulf was written down by Christians. It does not mention any god other than the Christian one, although it refers to fruitless offerings to other gods, see lines 170-188. Presumably to the mind of the person who wrote down the poem (in all probability a monk), the Danes would not have been afflicted by Grendel if they had been Christians.
Macbeth's thanedom is called Cawdor.
Brave Macbeth
In the book, it's Castle Rock. We have to assume it's the same for the movie.
In the play, Macbeth as king fights his last battle against Macduff, thane of Fife. Macduff kills and beheads Macbeth. The battle takes place near Macbeth's royal castle at Dunsinane. But according to the Chronicles by Raphael Holinshed [d. 1580], King Macbeth was wounded during the battle of Lumphanan against the forces of the future King Malcolm III [d. November 13, 1093]. He died from those injuries a few days later, on August 15, 1057, about 60 miles away, in Scone where he had been crowned in 1040. King Macbeth was buried in the royal burial ground for kings of Scotland, Norway, and Ireland just off the west coast of Scotland, on the island of Iona. Also named Saint Columba's Island, the isle was the last resting place of King Duncan I [d. August 14, 1040], who had had King Macbeth's father killed and whom King Macbeth in turn had killed in battle.
No, unfortunately there is no film of "castle in the air" and that "castle in the sky" is completely unrelated. Actually, there is a musical film called "Castle in the Air." Stars Frankie Laine, Billy Daniels and Arthur Franz. made in the 1950's. It was originally called "Rainbow on My Shoulder" I haven't read the book so I don't know if it is connected. Castle in the Air is a book written by Dianne Wynne Jones, Castle in the Sky is a movie directed by Hayao Miyazaki. I can understand how those two can be confused. Hayao Miyazaki did do another movie called Howl's Moving Castle which is based on a book of the same name by Dianne Wynne Jones. That book is part of the same series that Castle in the Air is in. So there is a connection.
The name of the wood in Macbeth is Birnam Wood. It plays a significant role in one of the prophecies given to Macbeth, which leads to his downfall.
Ben Castle's birth name is Benjamin Castle.