Where does “fals” come from?

fals (Catalan) comes from Latin falsus, from Latin fallō, from Proto-Indo-European ǵʰwel- — to bend; to lie, deceive.

fals (Catalan): false

Definitions

Step	Language	Word	Meaning
1	Latin	falsus	deceived, tricked, cheated, disappointed, having...
2	Latin	fallō	—
3	Proto-Indo-European	ǵʰwel-	to bend; to lie, deceive

fals — Etymology, Origin & Word History | Etymology Explorer