Where does “Chlorophyta” come from?

Chlorophyta (Translingual) comes from Ancient Greek χλωρός, from Proto-Indo-European ghlo-.

Ancestry of “Chlorophyta”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	χλωρός	greenish-yellow, pale green; pale, pallid; fresh,...
2	Proto-Indo-European	ghlo-	—

Chlorophyta — Etymology, Origin & Word History | Etymology Explorer