I have 3 Ada Horobin in my tree, two in Australia but none in Stoke area. Our line traces back to the Macclesfield area. The earliest I have confirmed is William Horobin, 1770 Sheen-1851 Macclesfield.
After that it gets a bit messy and circumstantial, however there is a cousin who thinks he has tied this line into a Staffordshire line, also from Sheen which extends back mutch further.
Allan