According to Griffiths Valuation, there are only 14 Hobbins' name in the whole of Ireland c. 1850's, 8 of which are in Tipperary There is a possibility that most of them were related as thier naming traditions are similiar. I would welcome any correspondence on this topic.
I have compiled a bit of information about Hobbins from Ireland, If you have any questions I may have the answer. If not I might be able to direct you.
Irene