What is the name of Raj's Yorkshire Terrier?

Raj’s Yorkshire Terrier is named Cinnamon.

Cinnamon enters Raj Koothrappali’s life after Howard and Bernadette give him a dog because they are concerned about his loneliness. Raj quickly becomes devoted to the small female Yorkshire Terrier and treats her like a cherished companion, even wondering whether she can fit inside his man-purse.

The dog’s name is a small but memorable part of Raj’s characterization. His affection for Cinnamon highlights his gentler, more sentimental side and becomes another source of teasing among the friends. Raj is an astrophysicist at Caltech, but his relationship with the dog is deliberately domestic and playful rather than scientific.

The answer is not one of the generic food names sometimes offered as distractors. Cinnamon remains the character’s established name throughout the series. In the finale, Raj leaves her with Bert while the main group travels to Sweden for Sheldon and Amy’s Nobel Prize ceremony.