I can actually see
Elsie climbing a bit. Maybe not hugely, but some. It has such a fresh, pretty sound to it, and seems honest and without airs but has a bit of dust, which is certainly the vogue (in the style of
Daisy,
Violet,
Stella,
Lily, etc).
Elsa is a little harsher and more Germanic, and seems more of a niche choice (i.e; more attractive to people with
German heritage, while
Elsie seems more flexible) so I can't see it being a huge favourite.