I donīt like the name Skrain much from its sound, but somehow it fits Dukat. Elmo just sounds... stupid...reminds me of some furry sesam street doll or so.
Gul Dukat of course sounds most familiar, but as Gul is a rang and not a name....
I would vote for both...Gul Dukat and Skrain Dukat, depending if he is on duty or not.
But as you asked for a name I think I put in my vote for Skrain then.