The Slusher charts sent to me by Pauline Seigo (and compiled by someone on the Knowles line, I'm not sure who) spell Emmazetta's husband's name variously as Thourborn, Thourburn, Thorburn, Thurborn, Thurbourn, and Thorbourn. The last form is the only one that any of the others are corrected to, though, so I'll use it for now.