May I throw in the despicable habit of Irish Theme Pubs (especially O’Neills) having Mna and Fir on their respective lavvies doors. As someone who speaks no Celtic language I made what might be seen to be a logical deduction. The men’s toilet will be in the room whose name is an anagram (and a peasy one at that) of the word Man. Wheras Fir is merely a shortening of the phrase “The fair (fir) sex”. Big error: cue stumbling into a den of harpies and harridens .