What about [name_f]Dee[/name_f], [name_f]DeeAnn[/name_f]/[name_f]Dee[/name_f]-[name_f]Anne[/name_f]/etc., or [name_f]Deanna[/name_f] (dee-anna)? As a PP mentioned, I think a lot of girls would dislike being named [name_u]Dean[/name_u] because it’s so clearly masculine. It could work as a middle, especially since using the mother’s maiden name as a middle is already established and many of these aren’t feminine, some are even clearly boys’ names. (Though I know a girl whose middle is like this and she hates it, so maybe you can’t win them all…)