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I really love the name Emily-Grace for a girl, but my daughter is Amelia-Rose, my mum says Emily and Amelia are too similar as they can both be shortened to Millie.. I'm not too sure though, thoughts?
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In their longer forms I don't think they're too close, but if you ever shorten Amelia to Millie or think you might in the future then I definitely think Millie and Emily are too close.