Though originally called 'Dunder and Blixem' in the 1823 publication, Santa's seventh and eighth reindeer are commonly known as 'Donner and Blitzen' today. Dunder and Blixem are Dutch words that translate to thunder and lightning. Some 19th and 20th century publications of the poem substituted the names 'Donder and Blitzen', which are German for thunder and lightning, and in other articles during the 20th century, 'Donner' replaced the name 'Donder'. After Johnny Marks penned the song Rudolph The Red-Nosed Reindeer in 1949, based on the story by Robert L. May, the name 'Donner' became the most popular spelling for the seventh reindeer originally named 'Dunder' in the poem A Visit From St. Nicholas. May's story and Marks' song were both well received and Rudolph is without doubt the most famous addition to Santa's team.