I have the exact opposite opinion to you cathf. I think with all the lovely names in the world why would you not choose something interesting/unusual? And what's wrong with standing out? I have/had an unusual name for the 70s/80s and people still comment on how lovely and unusual it is. I was never ever teased. I think kids accept any name as all names are new to them - it's the parents who say things and then the kids copy it.
The numerous Gemmas, Beckys, Annas, Emmas, Sarahs, etc in my school hated being the ones who had to have their surnames or different variations because there were just so many of them. Each fine names, but when you are one of 5 in your class and 20 in the year group, it's a bit wearing having to explain which one you are all the time.
Also i don't think people name their kids to draw attention to themselves, you will usually find similar style of names in similar social demographics, so it isn't unusual, it's just another name.
I don't think people try to think of a 'posh' name. They just choose names they love. My dc have unusual names which could be considered posh, did we think 'oooh lets make ourselves stand out and try to social climb' of course not. We thought 'oh Lysander is gorgeous' and that was basically the extent of it.
Your post comes across as quite mean spirited.