Where does “ৰাখ্” come from?

ৰাখ্ (Old Assamese) comes from Sanskrit रक्षति, from Proto-Indo-Aryan Hrákṣati, from Proto-Indo-Iranian Hrákšati, from Proto-Indo-European h₂lékseti, from Proto-Indo-European h₂lek- — to protect.

Ancestry of “ৰাখ্”, step by step

Step	Language	Word	Meaning
1	Sanskrit	रक्षति	to protect, defend, guard
2	Proto-Indo-Aryan	Hrákṣati	—
3	Proto-Indo-Iranian	Hrákšati	to protect, guard
4	Proto-Indo-European	h₂lékseti	to be protecting
5	Proto-Indo-European	h₂lek-	to protect

Every word from Proto-Indo-European h₂lek- →Every word from Proto-Indo-European h₂lékseti →Every word from Proto-Indo-Iranian Hrákšati →