Where does “so” come from?

so (Mauritian Creole) comes from French chaud, from Old French chaut, from Latin calidus, from Latin caleō, from Proto-Italic kalēō, from Proto-Indo-European ḱelh₁- — to warm up, to be hot; to warm up, be hot.

so (Mauritian Creole): his, her, its, one's; hot, warm

Definitions

his, her, its, one's; hot, warm

Ancestry of “so”, step by step

Step	Language	Word	Meaning
1	French	chaud	warm, hot; horny, randy; enthusiastic, willing,...
2	Old French	chaut	hot; hot; heat
3	Latin	calidus	warm, hot; fiery, fierce, vehement; spirited,...
4	Latin	caleō	to be warm or hot, glow
5	Proto-Italic	kalēō	—
6	Proto-Indo-European	ḱelh₁-	to warm up, to be hot; to warm up, be hot

Every word from Proto-Indo-European ḱelh₁- →Every word from Proto-Italic kalēō →Every word from Latin caleō →