Actress and former Queen of England Cate Blanchett went on Jimmy Kimmel Live on Monday and discussed how she decided on her youngest son's name. She explained that "you run out of ideas by the time you get to number three," but finally decided on "Ignatius" after reading a Captain Underpants book. Specifically, an edition of the series focusing on Professor Pee-Pee Poopypants and an attack by some talking toilets.

I was eight months pregnant and hallucinating, and there’s a section in the book where he gets so upset that everyone teases him because his name is Professor Pee-Pee Poopypants that he forces the world to change their names. They have this interior code, and they give these examples of names. You go down to ‘I’ and the example is Ignatius. It was like the Virgin Mary going ‘Boom! I must call him Jesus.’ I said, 'Ignatius must be his name.'

Sources: Jimmy Kimmel Live