masc. proper name, from Latin Basilius, from Greek Basileios "kingly, royal," from basileus "king," especially the king of Persia, "prince," possibly from a language of Asia Minor (compare Lydian battos "king"), but according to Beekes, it "is no doubt of PreGreek origin (i.e., not a loanword from another country)." The youngest of the Greek words for "king" (alongside koiranos and anax). St. Basil the Great lived 4c. and was the founder of Eastern monasticism.