Albus: Latin for ‘white,’ especially the flat white of stones or clothing. “Albion,” an ancient and poetical name for Britain comes from the same root.
Percival: Knight of King Arthur’s roundtable who was granted a glimpse of the Holy Grail. Albus shares this name with his father and Percy Weasley.
Wulfric: Anglo/Saxon. ‘wolf power’ or ‘wolf ruler.’ also, a 12thC British hermit saint known for his miracles and prophecies.
Brian: This may be a reference to “Monty Python’s The Life of Brian,” poking fun at the pretentiousness of all of his other names.
Dumbledore: 18thC Eng. word for ‘bumblebee.’ Rowling says she wanted to associate his name with bees because she imagines him wandering around the castle humming to himself. Interestingly, the word “Dumbledore” has another possibly important meaning “white hat”