IPA: /ˌɒnəˈmæstɪʃən/
KK: /ɑːnəˈmæstɪʃən/
A person who studies the names of people and places.
The onomastician researched the origins of various surnames.
Onomastician → It is formed from "onomastikos" (from Greek ὀνομαστικός, meaning pertaining to names) and the suffix "-ian" (meaning relating to or characterized by). An onomastician is someone who studies the history and origin of names.
Think of someone who studies 'names' ('onomastikos') and is characterized by that study ('-ian'). This helps you remember that an onomastician is a specialist in the field of names.
No commonly confused words.