Etymology
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femme (n.)
French, literally "woman," from Old French feme, from Latin femina "woman, a female," literally "she who suckles," from PIE root *dhe(i)- "to suck." Slang for "young woman" from 1928; meaning "passive and more feminine partner in a lesbian couple" attested by 1961.
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femme fatale (n.)

"attractive and dangerous woman," 1895, from French femme fatale, attested by 1844, from French femme "woman," from Latin femina "woman, a female" (see feminine) + fatale (see fatal).

Une femme fatale est une femme qui porte malheur. [Jules Claretie, "La Vie a Paris," 1896]

Earlier, such a woman might be called a Circe.

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cherchez la femme 
French, literally "seek the woman," on the notion that a woman is the cause for whatever crime has been committed, first used by Alexandre Dumas père in "Les Mohicans de Paris" (1864) in the form cherchons la femme. French chercher is from Latin circare, in Late Latin "to wander hither and thither," from circus "circle" (see circus).
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*dhe(i)- 

*dhē(i)-, Proto-Indo-European root meaning "to suck."

It forms all or part of: affiliate; affiliation; effeminate; effete; epithelium; fawn (n.) "young deer;" fecund; fellatio; Felicia; felicitate; felicity; Felix; female; feminine; femme; fennel; fenugreek; fetal; feticide; fetus; filial; filiation; filicide; filioque; fitz; infelicity.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dhayati "sucks," dhayah "nourishing;" Greek thēlē "mother's breast, nipple," thēlys "female, fruitful;" Latin felare "to suck," femina "woman" ("she who suckles"), felix "happy, auspicious, fruitful," fetus "offspring, pregnancy;" fecundus "fruitful, fertile, productive; rich, abundant;" Old Church Slavonic dojiti "to suckle," dojilica "nurse," deti "child;" Lithuanian dėlė "leech;" Old Prussian dadan "milk;" Gothic daddjan "to suckle;" Old Swedish dia "suckle;" Old High German tila "female breast;" Old Irish denaim "I suck," dinu "lamb."

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