Swiftbrook of the Red Fern is a prehistoric lamia and ancestor of the Redfern family. He is the youngest child and only son of Moonhunter and Ironwood, and the brother of Starlight. It is not specified if Swiftbrook ever had a mate or children. He is related to the modern Redferns, though they are not directly descended from him.
Swiftbrook is a traditional lamia name, as a brook is another name for a stream. Swift means to move quickly. His name could then roughly translate as 'fast moving stream'.
- If Swiftbrook did have children, they would have inherited the title 'of the Red Fern' and be counted as members of the Redfern family.