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Prince William's full name is William Arthur Philip Louis. When William was born on June 21, 1982, his parents didn't reveal his name until one week later. William's father, Prince Charles, was a month old before his name was made public.

The new baby, who weighed 8 pounds, 7 ounces at birth, is now fifth in line to the throne behind Prince Charles, William, George and Charlotte.

His official title will be His Royal Highness Prince [TBD Name] of Cambridge.

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