Where does “chaeta” come from?

chaeta (New Latin) comes from Ancient Greek χαίτη, from Proto-Indo-European gʰeh₂it- — curly hair.

Ancestry of “chaeta”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	χαίτη	loose, flowing hair; used especially of back...
2	Proto-Indo-European	gʰeh₂it-	curly hair