Rowena Cook, Robert Herbert, and Gemma Herbert are the children of American comedian, Jo Koy. There is very little information about them. Information about their ages, profession, spouse, and children, is unknown.

Born on June 2, 1971, Jo Koy and his family moved from Spanaway, Washington to Tacoma, Washington, and then to Las Vegas soon after he finished high school in Tacoma.

He attended Spanaway Lake High School and then moved to Foss High School in Tacoma. They moved to Las Vegas to be near his ailing grandmother. He enrolled in the University of Nevada, Las Vegas but dropped out to pursue stand-up comedy.

Jo Koy’s stage name comes from a nickname his family gave him growing up. It was revealed during his stand-up routine in Phoenix, Arizona, on September 22, 2019, that back in 1989, he was talking to his cousin about making a stage name when his aunt called him to come to dinner, shouting “Jo Ko eat!” (Ko means “my” in Tagalog, so Jo Ko means, “my Jo”). He misheard it and though she said “Koy,” decided it was a good name, and has used it ever since.