How many letters does the top answer for “wrote the blue bird” have?

The most common answer is daulnoy (7 letters).

Crossword clue: wrote the blue bird

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

daulnoy 7 letters wd-fact-v3

maeterlinck 11 letters wd-fact-v3

Belgian playwright (1862-1949)

wrote blue 67% similar → mitchell

wrote the birds 67% similar → hitchcock

author of the blue bird 50% similar → daulnoy, maeterlinck

wrote blue dragon 50% similar → toriyama

wrote blue velvet 50% similar → hopper, lynch

wrote the birds of america 50% similar → audubon

wrote the blue castle 50% similar → montgomery

wrote the painted bird 50% similar → kosinski