Correct spelling for the English word "Regious" is [ɹɪd͡ʒˈəs], [ɹɪdʒˈəs], [ɹ_ɪ_dʒ_ˈə_s] (IPA phonetic alphabet).
There seems to be a confusion in the word you provided. "Regious" is not a recognized word in English, and I could not find any information on its etymology. It is possible that the word you intended to ask about is "religious".
The word "religious" comes from the Latin term "religiosus", which means "pious" or "devout". In turn, this Latin word is derived from "religio", referring to "obligation", "bond", or "reverence". "Religio" stems from an older Latin term "relegere", combining "re-" (meaning "again") and "legere" (meaning "to read" or "to pick out"). Thus, "religious" originally implied a careful observance or dedication to specific rituals or duties, often in relation to spiritual or divine matters.