My DS is nearly 6.
He is irritated with people mispronouncing his name (there's a kid a couple of years older in school with the same name but he goes by the mispronunciation).
DS has argued with me for about the past 8 months on how to spell his name!!
He wants to spell it slightly differently to reflect how it should be said.
I much prefer the "correct" spelling.
AIBU to insist he spells his name correctly?
YABU: It doesn't matter, let him do it if it makes him happy
YANBU: Of course you should insist he spells it properly.