Clan Maclachlan claims as its eponymous ancestor Lachlan Mor. The surname Maclachlan is an Anglicised form of the Gaelic Mac Lachlainn which is the patronymic form of the Gaelic personal name Lochlann meaning "stranger". Lochlann was originally a term to describe Scandinavia, composed of the elements loch (meaning "lake" or "fjord") + lann (meaning "land").