Mary Helena Monica Harriet Doyle
From The Arthur Conan Doyle Encyclopedia
She was born on 4 may 1861 at 11 Picardy Place, Edinburgh (Scotland). But she died aged 2 on 3 june 1863 of laryngitis at Wilson's Park, Portobello, Edinburgh.
She is buried at High Cemetery, Dumfries, Scotland, reunited with his father and 2 older sisters.