But can I still come too?

I suppose that the plural of that would be Cinn Mraich, but that doesn't make sense because it would be "Heads of Beer" meaning that one beer had many heads, which isn't right unless it is Guinness.

I wonder if it is like the French, "Je vois beucoup d'hommes qui ont un chapeau sur la tete." where hats and head are singular to avoid people thinking there are men with many heads, and hats on top of those many heads.