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Slate, Stoney, Rocky and Jade. Real life kids.
Trust your gut! Your choice is the right one.
My name is Katie and I always have to spell it for people just bc there are too many choices... but it's not a big deal to me. I don't think he will mind that much. I would assume it is spelled Hart. I do think he will be more open to name-bullying though, it's a beautiful name but kids are mean and the perspective we have where we can appreciate it will be lost on those little buggers.
Not knowing the last name's syllables but I like Geneva Rosemary. I don't know if you're in the states or not but Merle is a man's name here - at least lately.