Where does “Senna” come from?

Senna (Portuguese) comes from Italian Senna, from French Seine, from Late Latin sagena, from Ancient Greek σαγήνη — large dragnet, seine; hunting net.

Ancestry of “Senna”, step by step

Step	Language	Word	Meaning
1	Italian	Senna	Seine
2	French	Seine	seine (for fishing)
3	Late Latin	sagena	seine
4	Ancient Greek	σαγήνη	large dragnet, seine; hunting net

Every word from Ancient Greek σαγήνη →Every word from Late Latin sagena →Every word from French Seine →