What is the name of the youngest Who in 'How the Grinch Stole Christmas!'?

The youngest Who in “How the Grinch Stole Christmas!” is Cindy Lou Who.

Cindy Lou Who is the little girl who catches the Grinch while he is disguised as Santa Claus and removing her family’s Christmas tree. In the original 1957 book, she is described as “no more than two,” making her notably younger than the other Who children.

Her age varies by adaptation. The 1966 animated television special also presents her as very young, while the 2000 live-action film portrays her as six years old. Those versions expand her role and family background, but retain the same canonical name.

Cindy is more than a small supporting character: her kindness helps expose the Grinch’s loneliness and contributes to his change of heart. A common mix-up is assuming the film’s six-year-old version represents the original book; the source story’s Cindy is much younger.