Quoting Flanaghan & Flanaghan Irish Place Names "the fact that (Port) basically means 'platform' (in Irish)explains why is should mean both 'Port' and 'Fort'"
This is how we get inland Ports like Yusser mentions up Ballaugh Glen and of course Port y Chee in Braddan and Port e Candis at St. John's. Of course we have some candidates for locations of Forts in Michael - See Rex Kissack's piece on Borodaill in the Proc. NH & AS. A coastal location gives us major problems as given the rate of coastal erosion in KM any place on the coast in the 16th or 17th c has long since been lost. You might have a bit more luck with the 19th c. This is why my landscape research is staying away from the NW of the Island!
Unless the Kaighins of the Phurt were sub-tenants, we should get them in Lib Assed, unfortunately I haven't yet transcribed Michael for 1540 however I see Frances has a fantastic transcript of the 1691 Survey of Lives foir KM which gives us three different holdings. One is obviously my ancestors (+ those of thousands more) at B'cregga but who were the others??