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I like Hallie, it's got a friendly sound. I think I prefer it to Hayley. Hayleys are pretty common in the UK but I've never met a Hallie of any spelling.
The astronomer Halley and his comet are usually pronounced like Hayley here (although apparently he pronounced it HALL ee) so that spelling would be confusing. I'd go for Hallie - maybe as an nn for Halina or Halide.