The Lightning Thief
The first book in the Percy Jackson series is called The Lightning Thief.
Book 5: Percy Jackson and the Olympians: The Last Olympian
No. Percy Jackson and the Olympians is the full name of the series, while Percy Jackson is the shortened, abbreviated name people like to use (it's a lot easier to say). The real second book of the series is Percy Jackson and the Sea of Monsters.
His first name is Perseus (like in the myth of Perseus, Percy is short for Perseus) and his last name is Jackson (since his mother is Sally Jackson and Poseidon doesn't have a last name). His middle name has not been mentioned. Perseus Jackson
There is no new Percy Jackson book, the series ended with "The Last Olympian." However, there is a new series that continues the Percy Jackson series, titled The Heroes of Olympus. The first book in this series is called the Lost Hero. It was released on October 12th, 2010.
Sally Jackson is the name of Percy's mom.
Labryinth
Poseidon, king of the sea
It depends on what book, considering that Percy has been to many schools.
The Last Olympian
In the book, his real name is Percy Jackson. In the movie, he is played by Logan Lerman.
Jannet is her name