What is the name of Bluey's younger sister?

Bluey's younger sister is named Bingo.

Bingo Heeler is the second child of Bandit and Chilli and the deuteragonist of the Australian preschool series *Bluey*. She is a Red Heeler puppy, while her older sister Bluey is a Blue Heeler. The sisters regularly play imaginative games together, with Bingo often bringing a gentler, more observant and sensitive perspective to their adventures.

Bingo is introduced as four years old and later turns five during the show's timeline. She attends kindergarten and has a close friendship with Lila, a Maltese dog. Her favourite toy is Floppy, a stuffed rabbit, and several episodes—including “Bingo,” “Turtleboy” and “Slide”—put her at the centre of the story.

Viewers sometimes confuse Bingo with Muffin or Socks because both are also young Heelers in the extended family. Muffin and Socks are Bluey and Bingo's cousins, the daughters of Uncle Stripe and Aunt Trixie. Bingo, by contrast, is Bluey's sibling and lives with Bluey, Bandit and Chilli.