IPA: //ˈneɪmseɪk//
KK: /ˈneɪmˌseɪk/
A person or thing that has the same name as another person or thing.
My son is named after my grandfather, so he is his namesake.
Namesake → It is formed from "name" (from Old English *nama*, meaning a word by which a person or thing is known) and "sake" (from Old English *saca*, meaning cause or reason). The word "namesake" refers to a person or thing that has the same name as another, often in honor of that person or thing.
Think of someone sharing a 'name' ('name') for the 'sake' ('sake') of honoring or remembering another person.
No commonly confused words.