UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌpɒlɪˈænə/US:USA pronunciation: respellingUSA pronunciation: respelling(pol′ē anə)

WordReference Random House Unabridged Dictionary of American English © 2020
Pol•ly•an•na  (pol′ē anə),USA pronunciation n. 
  1. an excessively or blindly optimistic person.

  1. (often l.c.) Also,  Pol′ly•anna•ish. unreasonably or illogically optimistic:some pollyanna notions about world peace.
Pol′ly•anna•ism, n. 
  • from the name of the child heroine created by Eleanor Porter (1868–1920), American writer

Collins Concise English Dictionary © HarperCollins Publishers::
Pollyanna /ˌpɒlɪˈænə/ n
  1. a person who is constantly or excessively optimistic
Etymology: 20th Century: after the chief character in Pollyanna (1913), a novel by Eleanor Porter (1868–1920), US writer

ˌPollyˈannaish adj
'Pollyanna' also found in these entries (note: many are not synonyms or translations):
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