The song "Have a Holly Jolly Christmas" was written by Johnny Marks, who was a well-known songwriter and composer in the 20th century. Marks is best known for his holiday songs, which include classics such as "Rudolph the Red-Nosed Reindeer" and "A Holly Jolly Christmas." Marks was inspired to write "Have a Holly Jolly Christmas" after hearing the phrase "holy jolly" in a book, and the song quickly became a popular holiday hit.