What is the name of Stephen Hawking's youngest child?

Stephen Hawking’s youngest child was Timothy Hawking. He was born in 1979, the third child of Stephen and his first wife, Jane Wilde Hawking.

Timothy’s older siblings were Robert, born in 1967, and Lucy, born in 1970. The three children were frequently mentioned together in accounts of Hawking’s family life and in statements issued after his death in 2018.

Timothy is sometimes confused with Lucy Hawking because Lucy became a prominent author and public figure, including through her science-themed children’s books co-written with her father. Robert, the eldest, pursued a career in software engineering. Timothy has generally maintained a lower public profile.

The name is also sometimes shortened to Tim in media coverage, but “Timothy Hawking” is the full name and the canonical answer for this question.