I always wind up calling mine by a one syllable nickname regardless of what their real name is. My Pyr's name is Diego. When he was a puppy, the last part of his name sounded too much like Echo's name, and it confused her. We started calling him Big Head because his head is huge. He responds to Diego, but we mostly just call him Big.
We have a dog in the race kennel named Zarola. She'll respond to it okay, but comes flying when you drop the first syllable and just call her Rola. Some of them really do prefer certain names over others!