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 Eljay Merton Morty Mort Jared Murray Murthuile Bealantin Gille Raibeart Year by Year Popularity of Lochlain