Where does “سر” come from?

سر (Classical Persian) comes from Sanskrit शूल, from Proto-Indo-Aryan śúHlas, from Proto-Indo-Iranian ćúHlas, from Proto-Indo-European ḱúh₃-los, from Proto-Indo-European ḱeh₃- — to sharpen, whet; sharpen.

Ancestry of “سر”, step by step

سر traces back through two separate lines of ancestry.

via Sanskrit शूल

StepLanguageWordMeaning
1Sanskritशूलany sharp instrument or pointed dart, lance,...
2Proto-Indo-AryanśúHlas
3Proto-Indo-IranianćúHlas
4Proto-Indo-Europeanḱúh₃-los
5Proto-Indo-Europeanḱeh₃-to sharpen, whet; sharpen

via Arabic سِرّ

StepLanguageWordMeaning
1Arabicسِرّsecret

Words derived from “سر

Every word from Proto-Indo-European ḱeh₃-Every word from Proto-Indo-European ḱúh₃-losEvery word from Proto-Indo-Iranian ćúHlas