Where does “cielo” come from?

cielo (Catacao) comes from Spanish cielo, from Old Spanish çielo, from Latin caelum, from Proto-Italic kailom, from Proto-Indo-European keh₂i-lom, from Proto-Indo-European keh₂i-.

cielo (Catacao): sky

Definitions

Ancestry of “cielo”, step by step

Step	Language	Word	Meaning
1	Spanish	cielo	sky; heaven
2	Old Spanish	çielo	Alternative spelling of cielo
3	Latin	caelum	heaven; sky; atmosphere, climate, weather
4	Proto-Italic	kailom	sky
5	Proto-Indo-European	keh₂i-lom	whole
6	Proto-Indo-European	keh₂i-	—

Every word from Proto-Indo-European keh₂i- →Every word from Proto-Indo-European keh₂i-lom →Every word from Proto-Italic kailom →