The name Posey is a girl's name of English origin meaning "a bunch of flowers". Posey and is often added to lists like Flower Names for Girls and discussed in our forums with posts like "Names on NB that make you go WOW!".
From the experts:
Posey is fashionable in England, a country of gardeners, but this pretty bouquet-of-flowers name is rarely heard here. A possible alternative to Rosy or short form for Josephine. Posey (or Posy or Posie) could also work as a nickname for a range of other names, from Penelope to Sophia. Other P-beginning flower names you may want to consider along with Posey: Poppy, Petal, Primrose.