Here is how I see it:

Side a, it is a good idea to ban some weird names as it can prevent (likely) unintentional grief in the life of a person who could be given certain weird names. It could (hopefully) help a parent to realize that maybe certains names really aren't a good idea.

Side b, who should get to decide what names are banned and why? A country (such as canada or the united states) could ban a name such as Jesus, and then have a Mexican immigrant  want to name their child Jesús (same name with different pronounciation, and and accent in mexican). How far would a government (in any country) go? Would they go so far as to create some list of names acceptable to name one's child and all other names are off limits? And think about it. Some names that may cause huge problems for a person as a first name may cause ZERO problems as a last name (such as a colour name).

JFG