Where does “loitier” come from?

loitier (Old French) comes from Vulgar Latin luctare, from Latin luctari, from Latin luctor, from Proto-Indo-European lewǵ- — to break, tear; to break, shatter.

Ancestry of “loitier”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	luctare	second-person singular present active imperative...
2	Latin	luctari	present active infinitive of lūctor
3	Latin	luctor	I struggle, wrestle, fight
4	Proto-Indo-European	lewǵ-	to break, tear; to break, shatter

Every word from Proto-Indo-European lewǵ- →Every word from Latin luctor →Every word from Latin luctari →