ah the limit is 12 characters... thought it was 16 tbh @_@
I was scrolling through the wiki article on the Dragon Language from Skyrim, but didn't really see any substitutes I'd want.
I did consider reducing Dovah to Dov, but Dov refers to Dragons as a species, not as an individual.
Think I'll just cut the third word out and swap in 'Se', which means 'of'. Basically making the nickname DragonOfIce
So I'll go with: DovahSeIiz