You Pup's Call Name
No matter how fancy the registered name might be you need a short Call Name. For Example, OwyheeStar's Deja Vu goes by Deja more often than not. When we call her, that is what we use. Sometimes it is shortened to Daj.
People disagree on whether it is best to have a one-syllable name or the two-syllable call name. Certainly, preference plays a part, but in a pinch, the one-syllable variety is easier to call out.
For the time when compliance is life and death, Dej would be quicker than Deja. It is not much of an advantage thought. The real truth is compliance and being willing to want to obey your command more than to do their own thing is far more important. This compliance issue refers to your relationship which needs to be of the right kind--respect.