Duke and Duchess of Cambridge reveal name of baby son

The Duke and Duchess of Cambridge have named their third child Louis Arthur Charles.

Prince William and his wife Catherine with their newborn son, who is fifth in line to the throne. (AAP) Source: AAP

The Duke and Duchess of Cambridge have named their baby son Louis Arthur Charles.

The couple's third child, who was born in London on April 23 at 11.01am (local time), weighing 8lb 7oz (3.8 kilograms), will be known as Prince Louis, Kensington Palace announced on Friday after a four-day wait.

"The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles," the Palace said in a short statement.

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