 Clan Maclachlan claims as its eponymous ancestor Lachlan Mor . The surname Maclachlan is an Anglicised form of the Gaelic Mac <unk> 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 " ) + <unk> ( meaning " land " ) . 
