Looking at other names nearby it is likely that we need to look for a
Scandinavian origin. On the 1877 OS map Ash Goe Mòr and Ash Goe Beag
are both shown.
www.old-maps.co.uk I've seen nothing that leaps out at
me for a meaning. The books I have on sea names are all west coast and
I can't see anything similar in them. How similar ash is to the
original word depends on how it has changed through Gaelic, Scots and
English mouths.
Buaidh gun robh leat!
Rob