It's not rarer, it's unique. And just because something is unique, doesn't mean it is good. You don't think about yourself when naming a child. You think about the child. That's why all of this is bullshit. If you want your kid to change their name / use their middle name, then go ahead - be selfish and go with "blessica". I can already see five different ways the name can be twisted, and believe me, other kids will find fifty more.

I know multiple people with "unique" names or surnames. Some are in the process of changing them - start using a new surname, to later make it official in their papers. The kid won't be unique or looked at favourably because they have a unique name either.