When Janet Murdoch was born on 15 June 1746, in Galston, Ayrshire, Scotland, her father, John Murdoch, was 32 and her mother, Mrs John Murdock, was 27. She married George Roxburgh on 6 August 1773, in Cathcart, Renfrewshire, Scotland, United Kingdom. They were the parents of at least 3 sons and 4 daughters.
Scottish: from an Anglicized form of the Gaelic personal names Muireadhach ‘mariner’, Murchadh ‘sea-warrior’, and Muircheartach ‘sea-ruler’, the first element in each being muir ‘sea’. The personal name was introduced into Yorkshire and Normandy by Norsemen from Ireland as early as the 10th century. The surname in post-Conquest medieval England usually belongs to Norman families.