It's not hard for a child to learn to spell a long name, for those of you doubting this is possible.
I have two DDs with four syllable names and know several other children with names just as long, or even longer. They had no problems with spelling. Even children with initial problems soon learned. Children tend to have idiosyncratic spelling initially but only those with an issue with spelling/ writing in general tend to have longstanding problems spelling their own name.
I also know children with Spanish and Polish names who learned the spellings easily despite an English speaking school environment and different pronunciations of certain letters - J, X, W for example.