In one variant version of the poem Solomon Kane's Homecoming is a reference to two characters named "Leigh and Yeo" possibly Amyas Leigh and Salvation Yeo from the novel Westward Ho! by Charles Kingsley.
Solomon Kane has had several appearances in comics, initially published by Marvel and, more recently, published by Dark Horse. Most of these appearances have been adaptations of Howard's stories but also some new adventures appeared. Marvel Comics' Solomon Kane has had encounters with other famous persons, including Dracula and Conan the Barbarian.
According to Philip José Farmer in Doc Savage: His Apocalyptic Life, Kane had a daughter named Bess (whose mother, another Bess, died in childbirth). Bess later married a Clarke, and - so Farmer reveals - Micah Clarke was one of their descendents. This makes Solomon Kane an ancestor of many members of the Wold Newton Family.