Meaning Derives from the Gaelic name Loch meaining 'lake or arm of the sea'. Origin of Lochlain Celtic , Irish Popular Middle Names John Pronunciation 🔊 Listen Lochlain LOK-lain Similar Names Morton Morell Mungan Beagin Frannsaidh Gayner Gervin Muireach Raghallach Steaphan Year by Year Popularity of Lochlain