Just to add - my DS doesn't have a long name, but it is 3 syllables. I hate him being called just the first syllable only! Thankfully, he associates that with a Thomas the Tank engine now so when my Dad, despite 2 years of telling him it's the full name not the short one, calls him the short one he'll have to read DS's favourite Thomas book to him! Hahaha! Dad's the only one to call him anything but his full name, though. I stopped MiL babying it up, my Mum and Sister have been told off (Sis now calls DS "Smudge" or "Smudgemeister" as a NN as I don't object to that!), Nursery were corrected on day 1 and no hassles thereafter... just my Dad. And Claudia isn't a name with a very common nickname so you may not even have those hassles.