What is the name of Peppa's little brother?

Peppa’s little brother is George Pig.

George is the younger son of Mummy Pig and Daddy Pig and Peppa’s younger sibling. He is usually shown wearing a blue shirt and carrying his favourite toy dinosaur, Mr. Dinosaur, which he often calls “Dine-saw.” His limited speech and loud crying are recurring comic features of the series.

George is a pig because Peppa Pig takes place in an anthropomorphic animal world: the characters behave like people while retaining traits associated with their species. A common mix-up is confusing George with Peppa’s friends, such as Pedro Pony or Suzy Sheep; neither is part of Peppa’s immediate family. In later episodes, George is also depicted wearing a hearing aid after moderate deafness is revealed.