Where does “robberfly” come from?

robberfly (English) comes from English fly, from Middle English flien, from Old English flēogan, from Old English -ende, from Proto-West Germanic *-andī, from Proto-Germanic -andz, from Proto-Indo-European -ónts, from Hungarian önt — sound, voice.

Ancestry of “robberfly”, step by step

robberfly traces back through two separate lines of ancestry.

via English fly

StepLanguageWordMeaning
1EnglishflyAny insect of the order Diptera; characterized by...
2Middle EnglishflienTo fly; to travel in the air; To move in the sky;...
3Old Englishflēoganto fly
4Old English-endeequivalent of English -ing; suffix for present...
5Proto-West Germanic*-andī
6Proto-Germanic-andz
7Proto-Indo-European-óntsDerives nouns denoting body parts
8Hungarianöntto pour; to cast; accusative singular of ön
9Hungarianönyou
10Hungarianön-self-
11Turkishönfront
12Ottoman Turkishاوكvoice (of human or animal); sound
13Proto-Turkicǖnsound, voice

via English robber

StepLanguageWordMeaning
1EnglishrobberA person who robs
2Middle EnglishrobbourA robber or burglar; one who robs or steals
3Old Frenchrobeorthief; burglar; robber
4Old French-eorAlternative form of -or
5Latin-ator-ator, -er; second-person singular future passive...
6Latin-tor-er
7Proto-Italic-tōrForms agent nouns to verb stems
8Proto-Indo-European-tōrDerives agent nouns from verbs, denoting someone...
9Proto-Indo-European-tor-s
Every word from Proto-Turkic ǖn