Shiloh Jolie-Pitt has a new nickname like her brothers

Brad Pitt, recipient of the Desert Palm Achievement Award Actor, arrives with Angelina Jolie at the 2012 Palm Springs International Film Festival Awards Gala, Saturday, Jan. 7, 2012, in Palm Springs, Calif. (AP / Chris Pizzello)

The five-year-old daughter of Brad Pi and Angelina Jolie is known for her tomboy habits and is now said to have asked her family to call her 'Shax' because it is similar to the names of her siblings Maddox, 10, Pax, seven, and three-year-old Knox.

A source told National Enquirer magazine: "For a while Shiloh had everyone in the family calling her Ben for some reason but she grew tired of that.

"These days she's decided she wants to be known as Shax because Maddox, Pax, and Knox's names all end in the letter X.

"Angelina and Brad are going along with it and think its cute."

Angelina - who also has daughters Zahara, six, and three-year-old Vivienne with Brad - has previously revealed that Shiloh always wants to be like her brothers.

She has said: "Shiloh dresses like a little dude. Shiloh, we feel, has Montenegro style. It's how people dress there. She likes tracksuits, she likes [regular] suits. She likes to dress like a boy. She wants to be a boy. So we had to cut her hair. She likes to wear boys' everything. She thinks she's one of the brothers."