I prefer [name_f]Elsie[/name_f] as a stand-alone, but if I were to use [name_f]Elsie[/name_f], as a nickname, which one should I choose? [name_f]Elsie[/name_f] is not necessarily an intuitive nickname for all of these, but I definitely think they can all work.
I love the idea of [name_f]Elsie[/name_f] for [name_f]Estelle[/name_f], but [name_f]Elsinore[/name_f] is very nice too. Or [name_f]Elisabeth[/name_f] (with a S).