Polly
"Polly" is a nickname, and often a name in its own right, for girls, which was derived from the name Molly. In 18th and 19th Century New England it was a common nickname for Mary.
Persons:
Polly Bergen, a singer and actress
Polly Klaas, a murder victim
Music:
"Polly" (song), a song by Nirvana
Polly (Kinks song), a song by the Kinks
"Polly Wolly Doodle", a popular children's song
"Sweet Polly Oliver", an English folksong
Polly (musical), a 1929 Broadway musical
Other:
A stereotypical parrot is often called Polly
Polly (robot), an early vision-based mobile robot
"Polly put the kettle on", nursery rhyme with Polly as the subject
Polly Pocket, popular children's toy, mostly played with by young girls
Polly (peanut), a Norwegian peanut snack brand
Polly and Molly were two genetically engineered sheep