What is the name of the clown form of the monster in IT?

The clown form of the monster in It is called Pennywise, or Pennywise the Dancing Clown.

Pennywise is the most recognizable identity used by the entity known simply as It. The creature is a shapeshifting predator that preys especially on children in Derry, Maine, taking forms tailored to its victims’ fears. It uses the clown persona because the appearance can seem inviting while also exploiting the unsettling fear many children associate with clowns.

Pennywise is not the monster’s only form. In the novel, It appears as figures including a leper, a mummy, and a giant spider-like creature. The entity’s deeper or truest nature is linked to the mysterious deadlights, which are difficult for human beings to perceive safely.

Stephen King’s novel was published in 1986 and follows the Losers’ Club across two timelines. The creature resurfaces roughly every 27 years, making Pennywise a recurring nightmare rather than an ordinary circus clown. Tim Curry and Bill Skarsgård later made the character famous in screen adaptations.