I think
Hallie is likable, as a NN or by itself...in a washed out but rich, organic way, if that makes sense - like the way natural dyes are pretty? It's a bit like
Sally (which I also like) but doesn't strike me as old-fashioned in quite the same way, maybe because of
Hailey.
Halle is ok, but, when I saw it written my first thought was to pronounce it more like 'holla' and it reminds me of Valhalla or
Holly more than
Hallie, despite knowing who
Halle Berry is.