Where does “Bolu” come from?

Bolu (English) comes from Turkish Bolu, from Ottoman Turkish بولی, from Ancient Greek πόλις, from Proto-Hellenic ptólis, from Proto-Indo-European tpólHis, from Proto-Indo-European tpelH- — fortification, city.

Ancestry of “Bolu”, step by step

StepLanguageWordMeaning
1TurkishBoludivided by; over
2Ottoman Turkishبولی—
3Ancient Greekπόλιςcity; a whole country, as dependent on and called...
4Proto-Hellenicptóliscity
5Proto-Indo-EuropeantpólHis—
6Proto-Indo-EuropeantpelH-fortification, city
Every word from Proto-Indo-European tpelH- →Every word from Proto-Indo-European tpólHis →Every word from Proto-Hellenic ptólis →