I want to tell my friend that her baby name is not a good one.
Why are you so offended by her baby name?
I've spent some time researching my baby names and I find this name to be hideous
You shouldn't tell someone what to name their baby. It is also rude to tell them it is bad and they will resent you for it.
But no one cares and they won't remember what I think of it.
I think that they will remember what you said about their baby name. You should not try to make them change it just because it is a name that you do not like.