[Opinions] I like it as a nn too - my family calls my sister "Posy" (m)
Though her name is Cassandra - Cassandra Rose to be exact, and so we got Posy by the poem
Rosy Posy puddin' 'n pie
Kissed the boys and made them cry
And when the boys came out to play
Rosy Posy ran away!
And she used to hide from little boys (she was very shy) and so we call her Posy.
She used to hate it but got used to it - she even put on her nametag when she worked at a department store lol! And apparently she got quite a few compliments!
PS: Has not much to do with the topic but kind of interesting. My sister's employers have been cool and let her put her nn on her name tags at all the places she's worked, but she choses a new nn at every place lol So she's gone as Posy, Cassie, Cass, Cash, Rosie, Bunny, Pumpkin, etc... It's been an interesting name experiment!