Pippa Middleton has named her new baby boy something very royal

The name of Pippa Middleton's baby son has FINALLY been revealed

Pippa Middleton names baby in tribute to dad and brother-in-law

The choice of the name Michael has special significance as James' brother Michael was aged 22 when he disappeared during a Mount Everest expedition.

The Daily Mail reports that the sister of the Duchess of Cambridge and her husband have named their son, who was born last month, Arthur Michael William Matthews.

The couple have also given their baby boy the middle names Michael and William.

Baby Arthur's middle name might be a tribute to Pippa's brother-in-law.

Pippa gave birth in the Lindo Wing at St Mary's Hospital in West London, the same place her sister Kate gave birth to all three of her children - George, Charlotte and Louis.

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The Mail cited the child's birth certificate, and we have an idea of how they chose the baby's three-part moniker. The name of Michael's wife gave the boy in honor of the family.

We know that Middleton and Matthews' baby will likely have many play dates with his older cousins but he will be bonded with the youngest of the Cambridge children in a unique way. Michael is also the name of Pippa's father. Middleton gave birth to Arthur in October just hours before Meghan Markle's pregnancy was announced by Kensington Palace.

Little Arthur was born October 15 in the Lindo Wing of St Mary's Hospital, which is where his cousins Prince George, Princess Charlotte and Prince Louis were also born.

Matthews was spotted running into the hospital on the day after the birth apparently in the same clothes he arrived in the day before.

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