Floyd Calderwood (first appeared in It)

Appears briefly in a flashback as a 1905 lumberjack with a shady past.

Floyd Calderwood is mentioned in the following books:

The Dark Tower VI: Song of Susannah (Jun 2004)

“Now he came out of the bathroom and crossed to the bureau. “Is this a practical joke?” he asked, rummaging for dry jeans and a fresh tee-shirt. To Eddie, King’s house said money—some, at least. God knew what the clothes said. “Is it something Mac McCutcheon and Floyd Calderwood dreamed up?”
- 11th Stanza / Chapter 6