Where does “Jēkabpils” come from?

Jēkabpils (Latvian) comes from Latvian pils, from Proto-Balto-Slavic pilis, from Proto-Indo-European pl̥h₁-í-s, from Proto-Indo-European tpelH- — fortification, city.

Ancestry of “Jēkabpils”, step by step

Jēkabpils traces back through two separate lines of ancestry.

via Latvian pils

StepLanguageWordMeaning
1Latvianpilspalace; castle
2Proto-Balto-Slavicpilis—
3Proto-Indo-Europeanpl̥h₁-í-s—
4Proto-Indo-EuropeantpelH-fortification, city

via Latvian Jēkabs

StepLanguageWordMeaning
1LatvianJēkabsJacob Biblical figure
Every word from Proto-Indo-European tpelH- →Every word from Proto-Indo-European pl̥h₁-í-s →Every word from Proto-Balto-Slavic pilis →