Kreecher - My name, my sister, my friend and her daughter are all on your list lol.
I agree about Dawn - sorry - but interesting that the French version of the name, Aurore, is very pretty but impossible to pronounce in English.
I know a very pretty Mary and a Donna (grown ups) and that makes the names pretty for me. Donna means 'woman' in Italian and versions of Mary are surely the most enduring names in Europe if not most of the Latin world - Maria, Marie et al.
So, there aren't really many names I find unspeakable, though I have a dislike for the American imports, Madison, Tigan (sp?), etc. But that is how many names start off - Tracy being an example.
I know four couples with daughters named Ruby and there are also a lot of Milly, Tilly type names which is going to make those names date very quickly unfortunately. I love Tilda for short, I wish more unlikely nicknames could emerge - lots of people decide on a nickname in advance now, don't think that happened in the past.
Bit rambling sorry...