I can't find a gaelic translation for squid either. I did come across some gaelic text in my searches where the phrase 'squid ink' stood out among a whole block of gaelic prose suggesting that either there is no gaelic for squid or squid is a gaelic word . Sometimes when I'm 'up north' I'll accidentally tune to a gaelic radio station and there will be several minutes of incomprehesible words then someone will say 'helicopter' which is disconcerting. (It's usually a news story about mountain resue).

Obviously helicopter is a more modern word than squid, hence no gaelic equivalent.
I did find this web site for the gaelic society of Inverness and there is an email address where you could email the secretary if that's any help.

http://www.gsi.org.uk