Where does “Primorsky” come from?

Primorsky (Portuguese) comes from Russian Примо́рский, from Russian примо́рье, from Russian мо́ре, from Old East Slavic море, from Proto-Slavic moře, from Proto-Balto-Slavic *mári, from Proto-Indo-European móri, from Proto-Indo-European mer- — to die; to disappear; sea, lake, wetland.

Ancestry of “Primorsky”, step by step

Primorsky traces back through two separate lines of ancestry.

via Russian Примо́рский

StepLanguageWordMeaning
1RussianПримо́рскийcoastal, maritime, seaside, littoral
2Russianпримо́рье
3Russianмо́реsea
4Old East Slavicмореsea, lake
5Proto-Slavicmořesea; body of water
6Proto-Balto-Slavic*márisea
7Proto-Indo-Europeanmórisea; standing water
8Proto-Indo-Europeanmer-to die; to disappear; sea, lake, wetland

via Czech mořský

StepLanguageWordMeaning
1Czechmořskýsea
2Proto-Slavic*morьskъsea
Every word from Proto-Indo-European mer-Every word from Proto-Indo-European móriEvery word from Proto-Balto-Slavic *mári