In the Scottish death indexes married women are listed twice, under their maiden name and also under their married name.
The instructions for indexing asked for even more than that: "married women and widows are indexed under all the maiden names and surnames with which, on the face of the entries, they may have been identified". That could, in theory, be all of her husbands' names, her father's name, and if not legitimate her mother's name, her putative father's name, and any subsequent husbands' names of her mother!
But I've never seen an actual index, and I don't think images of them are available. Only one bound copy of each volume was made, to be kept in Register House. Obviously it was a true index - for finding registration records with - and not intended to be normative.