Anonymous

google

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late 16th century: via late Latin from Greek anōnumos ‘nameless’ (from an- ‘without’ + onoma ‘name’) + -ous.

wiktionary

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Borrowed into English around 1600 from Late Latin anonymus, from Ancient Greek ᾰ̓νώνῠμος(anṓnumos, “without name”), from ᾰ̓ν-(an-, “un-”) with ὄνῠμᾰ(ónuma), Aeolic and Doric dialectal form of ὄνομᾰ(ónoma, “name”).

etymonline

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anonymous (adj.)

c. 1600, "without a name;" 1670s, "published under no name, of unknown authorship," from Late Latin anonymus, from Greek anonymos "without a name," from an- "without" (see an- (1)) + onyma, Æolic dialectal form of onoma "name" (from PIE root *no-men- "name").