Saintclair is of Scottish origin, derived from the surname 'Sinclare', which was an anglicized form of the Gaelic 'Séon Claíomh'. It translates to 'clear, bright, shining'. The name gained prominence through the Saintclair family, who were notable in Scottish history. It was initially a surname but has since been adopted as a given name.
"The name Saintclair experienced fluctuations in popularity throughout the mid-20th century, with peaks in the late 40s and early 50s, and a steady decline thereafter."