Usage: 5 forms in 15 verses
Form Translated As     In Verse(s)
ονομαστόσ famous LXX.1Chr.11.20
ονομαστόν a famous LXX.Isa.56.5LXX.Jer.13.11LXX.Ezek.39.13
famous LXX.Deut.26.19
of renown LXX.Ezek.39.11
ονομαστούσ fame LXX.Zeph.3.19
famous LXX.Jer.52.25LXX.Zeph.3.20
famous ones LXX.Ezek.23.23
ονομαστοί famous LXX.Num.16.2LXX.1Chr.5.24LXX.1Chr.12.30
renowned LXX.Gen.6.4
ονομαστή famously LXX.Ezek.22.5

Liddell-Scott-Jones

ὀνομαστός (onomastos) famous G:N-M

ὀνομαστός-αστός, , όν,

in dialects ὀνῠμ- [Refs 5th c.BC+] (as proper name of a Delphian, [Refs]:— named, to be named, and οὐκ ὀνομαστόςαστός not to be named or mentioned, i.e. abominable, Κακοΐλιον οὐκ ὀνομαστόςαστήν [Refs 8th c.BC+]

__II of name or note, famous, [Refs 6th c.BC+]: comparative and superlative, [Refs 5th c.BC+]
__II.2 of things, notable, ὀνομαστόςαστὰ πράσσων [Refs 5th c.BC+]