In Philosopher's Stone, Hermione mentions that she heard Dumbledore was in Gryffindor. It was also confirmed in the Pottermore welcome video for students sorted into Gryffindor House.
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Albus Dumbledore was in Gryffindor house. This was first mentioned by Hermione Granger when she first met Harry Potter and Ron Weasley. It was reiterated at several points throughout the series and is included in the introduction to Gryffindor on Pottermore.
Dumbledore's full name is Albus Percival Wulfric Brian Dumbledore, giving him three middle names.
Albus Percival Wulfric Brian Dumbledore and his brother was called Aberforth Dumbledore He also had a sister called Ariana Dumbledore.
Albus Dumbledore was a half-blood.
Albus Dumbledore is male.
Aberforth Dumbledore is his full name. No middle name has ever been mentioned.