Ok, so tonight I made the Rock-Afire Explosion as humans in CAS. The characters I made are Billy Bob Brockali, Looney Bird, Rolfe DeWolfe, Dook LaRue, Fatz Geronimo, Beach Bear, Mitzi Mozzarella, and ...
Have you tried out saving sims with these names individually? This way you can single out which one has the problematic name. The online Urban Dictionary lists "Dook" as short for dookie which apparently means poop. Maybe a game that includes a talking toilet doesn't like poop in their sims' names?