There are many McNaught's from Dumbarton, Scotland. Margaret b 1811, James b 1833, John b 1811, Agness b 1841, Ann b 1831, Elizabeth b Elizabeth b 1836, Helen b 1837, Jean b 1821 and so on.
Is there a particular time frame that you are interested in? Do you have any first names that you want to find? Are you looking for parents of people you know about?