The only association I have with the name Poppy is that's what we called my grandfather growing up :)
When i was younger i lived in england and there was a sweet new baby girl named Poppy and she was precious! nothing but sweet memories for this name!
I've no idea why Poppy would be considered unusable. I'm assuming you're in America because it's a very popular name in Britain, Australia, New Zealand, etc. I know a baby born recently on Anzac Day (April 25) who was named Poppy in honour of the day! NB: If you don't know, Anzac Day honours soldiers who fought in wars for Australia and New Zealand. The poppy is the symbol of the day. I think it's a sweet name, although it's rather cutesy.
It's usable, but Poppy sounds like something you call your grandfather...
My stepdad's grand kids call him Poppy. But it still sounds like a girls name to me. A cute one. A bit too cute for my taste but still usable.
I can imagine it being maybe a LITTLE bit more difficult to use in areas with a large Hispanic population, since "papi" means daddy and sometimes in a flirtatious or lascivious way. "Ay, papi," etc.
That's the only even remotely sexual connotation I can think of for it. And it doesn't make the name unusable anywhere in the States, really.
I can't help but think that school children might call her Poopy instead. Otherwise, Pop, Papa, Poppy... too grandfathery for me.
I love Poppy! I think it's so adorable, and I love the idea of Lucy, Ruby, and Poppy as sisters. :) I'll be the first one to admit that I'm extremely naive when it comes to sexual matters, haha, but I really can't think of anything sexual connected to Poppy? I think it's sweet, and I like the connection to Remembrance Day/Veteran's Day. :)
The Veteran's Day/ANZAC thing makes me think of dead soldiers. A field of flowers is a pretty image in itself, but the red poppies for the blood-soaked battlefields and cemetaries is pretty morbid.
Putting aside the war image, there's opium.
I dunno, poppies seem one of the more problematic flowers. I couldn't use it. And I'm the sort that likes Lily/Daisy/Violet kind of names.
It's quite popular here in Australia though.