Where does “interrogatus” come from?

interrogatus (Latin) comes from Latin interrogō, from Latin inter, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.

interrogatus (Latin): asked, questioned, inquired, interrogated,...

Definitions

Step	Language	Word	Meaning
1	Latin	interrogō	to ask, question, inquire, interrogate, to seek information from
2	Latin	inter	between, among; during, while
3	Proto-Indo-European	h₁entér	between
4	Proto-Indo-European	h₁en	in; in, inside