Where does “Seyed” come from?

Seyed (English) comes from Persian سید, from Arabic سَيِّد, from Persian جان, from Middle Persian yʾn', from Proto-Iranian *wyaHnáH, from Proto-Indo-Iranian wyaHnás, from Proto-Indo-European h₂enh₁‑ — to breathe.

Ancestry of “Seyed”, step by step

StepLanguageWordMeaning
1PersianسیدSayyid, an honorific title borne by male...
2Arabicسَيِّدmaster, lord; liberal, generous; noble,...
3Persianجانsoul; being; life
4Middle Persianyʾn'—
5Proto-Iranian*wyaHnáH—
6Proto-Indo-IranianwyaHnás—
7Proto-Indo-Europeanh₂enh₁‑to breathe
Every word from Proto-Indo-European h₂enh₁‑ →Every word from Proto-Indo-Iranian wyaHnás →Every word from Proto-Iranian *wyaHnáH →