Proto-Slavic *tьrnъ

→ Czech trn (inherited)

→ Old Church Slavonic трънъ (inherited)

→ Old Church Slavonic трьнъ (inherited)

→ Macedonian трн (inherited)

→ Polish cierń (inherited)

→ Polish tarnina (mention)

→ Polish tarń (inherited)

→ Polabian dren (inherited)

→ Romanian Târnava (derived)

→ Romanian Târnava Mare (derived)

→ Romanian Târnava Mică (derived)

→ Russian тёрн (inherited)

→ Serbo-Croatian trn (inherited)

→ Serbo-Croatian трн (inherited)

→ Slovak tŕň (inherited)

→ Ukrainian терен (inherited)