The artist known as digbat

I thought about this when I read something that referred to Prince “changing his name to a Zapf Dingbat.” What are the limits of legal names or name changes when it comes to something like this? A graphic design such as TAFKAP likes to be not called can be trademarked and copyrighted but it can’t be typed. What if I wanted to mistreat a baby by giving it such an “innovative” name? “His name is Bob, but only in Bodoni poster 16 point, not courier, and punctuated with an unpronouncable symbol.”