Meaning A boy's name of Welsh origin, it means "Dwells by the alder tree river Origin of Gwernach Welsh +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Gwernach Similar Names Garnoc Garnock Nairne Amhuinn Romney Renfrew Rhinffrew Rumenea Nairn Verne Year by Year Popularity of Gwernach