Could be an orthographic problem - I know someone whose name, Letty, was written down by her parents and submitted like that when her birth was registered, to avoid errors, but the clerk misread their handwriting and on all the documentation she's been Setty for life!
That Hosie looks suspiciously like Rosie - have you seen the actual entry? (My great-grandfather's birth certificate is beautifully written in copperplate, and is extremely hard to read. Lovely to look at, though!)
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