Kirsty
I am afraid that I cannot confirm a link (yet).
All I have as a remote possibility is a James OSMOND (b.1836 somewhere in Devon) who was the second son of a William OSMOND (b.1801 in Fremington, Devon) and Rebecca (Surname Not known and b.1808 in Atherington, Devon).
I have been unable to trace James in the 1851 Census or later. The birth date would be about right for a child to be born in 1858, but you would need to locate the marriage certificate for James and Sarah OSMAN and this would confirm their parents.
Sorry that I am unable to help further.
Robin