Where does “quadragēna” come from?

quadragēna (Late Latin) comes from Latin quadrāgēnus, from Latin -ārius, from Proto-Italic *-āzios.

Ancestry of “quadragēna”, step by step

Step	Language	Word	Meaning
1	Latin	quadrāgēnus	—
2	Latin	-ārius	—
3	Proto-Italic	*-āzios	—