Where does “ซี” come from?

ซี (Isan) comes from English cee, from Middle English cee, from Old French sei, from Latin sēdēs, from Latin sedeō, from Proto-Italic sedēō, from Proto-Indo-European sḗd- — to sit.

Ancestry of “ซี”, step by step

ซี traces back through 3 separate lines of ancestry.

via English cee

StepLanguageWordMeaning
1EnglishceeThe name of the Latin-script letter C; Something...
2Middle EnglishceeAlternative form of see
3Old Frenchsei
4Latinsēdēsseat, chair
5Latinsedeōto sit, to be seated
6Proto-Italicsedēōsit, be sitting, be seated
7Proto-Indo-Europeansḗd-to sit

via Proto-Tai siːᴮ

StepLanguageWordMeaning
1Proto-Taisiːᴮfour
2Middle Chinese
3Proto-Sino-Tibetan*pV-lijfour

via Proto-Vietic siː

StepLanguageWordMeaning
1Proto-Vieticsiːarm, hand
2Proto-Mon-Khmersii(ʔ)

Words derived from “ซี

Every word from Proto-Indo-European sḗd-
ซี — Etymology, Origin & Word History | Etymology Explorer