IPA: /ˈtɒpənɪm/
KK: /ˈtɑpəˌnɪm/
A name that comes from a specific place or location.
The word 'Chicago' is a toponym that refers to a city in the United States.
Toponym is formed from "topos" (meaning place) and "onoma" (meaning name). The word refers to a name derived from a place, indicating the geographical origin of the name.
Think of 'topos' meaning place and 'onoma' meaning name — a toponym is essentially a name that comes from a specific place.