That would certainly be a fun little twist on the story. “Jack” could easily be a nickname for a Jacqueline.
I don’t think it contradicts the mistaken identity bit, they’re two separate events/people. We saw Jack’s skeleton in the Giant’s house, and we saw James die at another time and place. James could have been part of the battle with the giants, but he ended up escaping and surviving it, unlike poor Jack.
That would work. I think the casting call for “Helena” a fierce hunter, is actually Jack (played by Cassidy Freeman). I think Arlo is the giant’s older brother who warns him not to venture down the beanstalk.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy