IPA: /ˌɒnəˈmæstɪkli/
KK: /ˌɑːnəˈmæstɪkli/
In a way that relates to the study of names and their origins.
The researcher analyzed the data onomastically to understand naming trends in different cultures.
Onomastically → It is formed from "onoma" (from Greek, meaning name) and the suffix "-ically" (meaning in a manner relating to). The word "onomastically" refers to something that relates to the study or use of names.
Think of 'onoma' meaning 'name' to remember that 'onomastically' relates to the manner of names.