Not exactly bad, but hard for the child when a parent spells a name differently to how it's pronounced for whatever reason (some I've known have been because it looks prettier).

I knew a Madeleine which they pronounced Madalyn (and I started pronouncing it initially like the like french cartoon character till they corrected me).

I also knew an Aisleen which the parent was seriously offended I pronounced it like 'I lean', when I should have realised it was the Irish pronounciation Ashleen - duh to me.

Fine if you want to do something a bit fancy pants/out of the ordinary, but don't expect people not to mispronounce it all of the child/adult's life and don't get offended when people do!