Where does “जागृ” come from?

जागृ (Sanskrit) comes from Proto-Indo-European h₁ger- — to be awake, to awaken; to be awake, to wake up.

Ancestry of “जागृ”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	h₁ger-	to be awake, to awaken; to be awake, to wake up

जागृ — Etymology, Origin & Word History | Etymology Explorer