Logainm does not have any suggestion for ‘Soghmas’ or ‘Soghmais’. Neither does Foclóir.ie.
Dúchas.ie is a website/database of translation of surnames and it does not have any name beginning with ‘Sog’ or ‘tSog’.
Yet the sign on Ballard Road in Milltown Malbay reads Bóthar an tSoghmais.
This is another puzzle which may require a return visit to Milltown Malbay and enquiring of the local publicans – all in the spirit of research…..