Meaning A boy's name of Greek origin, it means "Variant of Eustace: Fertile." Origin of Eustachius Greek +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Eustachius Similar Names Eustis Eustache Eustasius Eustazio Avon Eperaima Epelaima Alex Daimen Daimon Year by Year Popularity of Eustachius