Mid 19th century; earliest use found in Augustus De Morgan (1806–1871), mathematician and historian. From ancient Greek (Doric and Aeolic) ὀνυματ-, ὄνυμα name + -ic.
Definition of onymatic in US English:
onymatic
adjectiveɒnɪˈmatɪk
rare
Onomastic.
Origin
Mid 19th century; earliest use found in Augustus De Morgan (1806–1871), mathematician and historian. From ancient Greek (Doric and Aeolic) ὀνυματ-, ὄνυμα name + -ic.