Besides Cyril, Nigel, Trevor, and Cecil, I always think Malcolm sounds very British. Agatha and Cecily do too.
And in the US, naming daughters by names traditionally male or traditionally surnames has been enormously popular for a generation and more, so there are plenty of females called Hunter, Tyler, Madison; also names fairly commonly in the US go from male to female (Vivian, Frances, Leslie) but almost never go from female to male.