Where does “তাম” come from?

তাম (Assamese) comes from Early Assamese তামা, from Sanskrit ताम्र — copper.

তাম (Assamese): copper

Definitions

Step	Language	Word	Meaning
1	Early Assamese	তামা	—
2	Sanskrit	ताम्र	copper

তাম — Etymology, Origin & Word History | Etymology Explorer