I think it depends on the situation.
If two people re pregnant at the same time and one uses the name the other was going to use, especially if they know the sex, then i think thats a bit rude.
But to rule out a name because someone (who may not be UTD, or even TTC) has told you they like it? Soooo, what if they dont ever have a baby, or dont have one of the right sex, are you suppoed to not use a name on the off chance that they do have the right baby, and still like the name by then?
What if that name happened to be at the top of your list to, and you are pregnant, but hadnt been talking names and they just blurt out oh i really like Susan for a girl...so what you cant use it now? Not in my book.

