The four crossword solutions for the term FIRST NAME IN MYSTERIES are Ellery (6 letters), Erle (4 letters), AGATHA (6 letters), and Ngaio (5 letters). Ellery is a male name, while the other three are female. Ellery is the first name of the fictional detective created by American author Frederic Dannay and Manfred B. Lee, who wrote under the pseudonym of 'Ellery Queen'. Erle is the first name of the British crime writer Erle Stanley Gardner, who wrote the Perry Mason series. AGATHA is the first name of the English crime writer AGATHA Christie, who is best known for her detective novels featuring characters such as Hercule Poirot and Miss Marple. Ngaio is the first name of the New Zealand crime writer Dame Ngaio Marsh, who wrote 32 detective novels featuring the character Inspector Roderick Alleyn.