Pippa and Kate Middleton went by the nicknames 'Pip' and 'Squeak' at school

We know quite a bit about Duchess Kate. She secretly would love to be a farmer, she wants to raise her two children 'her way,' she carries a clutch for a very specific reason and her go-to dish to cook is curry. And yes, we know her real name is Catherine.

SEE ALSO: The queen rode the train on Monday

With that said, we never knew this. The Duchess of Cambridge supposedly went by the nickname "Squeak" in school. Random, right? Well, once you hear her sister, Pippa's, nickname, it may make a bit more sense.

PHOTOS: Kate and Pippa at Pippa's wedding

Apparently, the names come from the school's pet guinea pigs.

"There was one called 'Pip' and one called 'Squeak,'" the royal mom revealed to students at her old school, St Andrews, in Pangbourne, Berkshire. "So my sister was called 'Pip' and I was 'Squeak.'" Okay, so it's still random, but a little less so, right?

The Duchess of Cambridge apparently shed that moniker when she went to university and started being called "Kate."

The rest of the royal family isn't without their fair share of nicknames (Her Majesty, specifically). Prince George adorably calls Queen Elizabeth II "Gan-Gan," and judging by the 2006 film "The Queen," starring Helen Mirren, Prince Philip calls his wife "Cabbage."

We'd love to hear the story behind that one.

RELATED: Kate's sassy looks