Two of our GC have 'different' christian names, their parents wanted something unusual that couldn't be shortened. One name I always thought of as a dog's name. The other describes a red-coated animal with a white tipped bushy tail, but with an different spelling . It took us a while to get used to it but I really like it now. And if they don't like their first names as they grow up they have more ordinary middle names to choose from.
Our family have a history of disliking their given names and choosing to be called something else. It makes tracing the family history very difficult sometimes.
I have always like old names (Victorian, Dickensian, biblical) so two of our sons have biblical names (not fashionable at the time), and the other a longer ordinary name. Unfortunately the longer name when shortened together with our surname has unfortunate connotations ! Something we didn't forsee at the time. But our son has survived all the teasing at school and is probably a little tougher because of it.
Children grow up with their names and don't consider them unusual until someone comments on it. But I do wish parents would think carefully before opting for an alternative spelling,. Having your name constantly misspelled or having to spell it out for other people can get very tiresome.